LPIC-1 Linux Installation and Package Management — 30 Questions

Question 1

A system administrator needs to install the latest version of a package named 'webapp' from a third-party repository that has been added to the system. Which command should be used to update the package list and install the package in one step?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

apt-get update && apt-get install webapp. It first runs `apt-get update` to refresh the local package index from all configured repositories (including the third-party one), then uses `&&` to conditionally execute `apt-get install webapp` only if the update succeeds. This ensures the latest version available from the third-party repository is fetched and installed in a single command sequence.

Answer

apt-get upgrade webapp

Answer

dpkg -i webapp.deb

Answer

apt-cache search webapp && apt-get install webapp

Question 2

A Linux administrator is troubleshooting a package dependency issue. When attempting to install package 'foo', the package manager reports a missing dependency 'libbar.so.2'. Which of the following is the most appropriate next step?

Accepted Answer

Use 'apt-file search libbar.so.2' or 'dnf provides libbar.so.2' to find the package that contains the file. The error indicates that the file 'libbar.so.2' is missing from the system. The most appropriate next step is to identify which package provides this file, so that it can be installed to satisfy the dependency. On Debian-based systems, 'apt-file search' queries the package repository metadata to find the package containing a specific file; on Red Hat-based systems, 'dnf provides' performs the same function. This targeted search is the correct first troubleshooting step before any installation or library cache update.

Answer

Run 'ldconfig' to update the library cache

Answer

Reinstall the 'foo' package using 'rpm -i --force foo.rpm'

Answer

Run 'rpm -q --whatrequires libbar.so.2'

Question 3

A company maintains a private Debian repository for internal packages. A new package 'internal-tool' version 2.0 has been added to the repository, but when users run 'apt-get update && apt-get install internal-tool', the old version 1.0 is still being offered. What is the most likely cause?

Accepted Answer

The repository's Release file has not been regenerated after adding the new package. The most likely cause is that the repository's Release file has not been regenerated after adding the new package. APT relies on the Release file (and its associated InRelease or Release.gpg) to obtain the current package metadata, including version information. If the Release file is not updated to reflect the new package version 2.0, APT will still see the old metadata and offer version 1.0, even though the package file exists in the repository.

Answer

The package version number is not higher than the installed version

Answer

The local apt cache needs to be cleared with 'apt-get clean'

Answer

The 'apt-get update' command did not run successfully due to network issues

Question 4

A system administrator wants to compile and install a program from source. After running './configure --prefix=/opt/myapp', the configure script fails with an error about missing 'libssl-dev'. What should the administrator do to resolve this issue?

Accepted Answer

Install the 'libssl-dev' package using the package manager. The configure script requires the development headers and static libraries for OpenSSL to compile software that uses SSL/TLS. The 'libssl-dev' package provides these headers and the .so symlinks needed during compilation. Installing it via the package manager (e.g., apt, yum) is the correct and standard method to satisfy this build dependency.

Answer

Manually download and place the missing header files in /usr/include

Answer

Install the 'libssl' runtime library

Answer

Add the '--disable-ssl' flag to ./configure

Question 5

A technician needs to remove a package named 'apache2' along with its configuration files from a Debian system. Which command should be used?

Accepted Answer

apt-get purge apache2. The 'apt-get purge' command removes the specified package along with its configuration files from a Debian system. Unlike 'remove', which leaves configuration files intact, 'purge' deletes both the package binaries and the associated configuration data from /etc and other locations, fulfilling the requirement to remove 'apache2' completely.

Answer

dpkg -r apache2

Answer

apt-get autoremove apache2

Answer

apt-get remove apache2

Question 6

A Linux administrator is managing a server that uses RPM-based package management. They need to find which installed package provides the '/etc/ssh/sshd_config' file. Which command should they use?

Accepted Answer

rpm -qf /etc/ssh/sshd_config. The correct command is `rpm -qf /etc/ssh/sshd_config`. The `-q` flag queries the RPM database, and `-f` (or `--file`) tells RPM to find which installed package owns the specified file. This is the standard way to map a file back to its originating package in RPM-based systems.

Answer

rpm -qi /etc/ssh/sshd_config

Answer

rpm -ql /etc/ssh/sshd_config

Answer

rpm -qa | grep sshd_config

Question 7

An organization uses a custom YUM repository. After adding a new RPM package to the repository, clients running 'yum update' do not see the new package. The repository metadata was regenerated using 'createrepo'. What is the most likely reason the clients are not seeing the update?

Accepted Answer

Clients have cached metadata and need to run 'yum clean all' or wait for cache expiration. YUM clients cache repository metadata locally to improve performance. When a new package is added to a repository and 'createrepo' regenerates the metadata, clients will not see the update until they refresh their cached metadata. Running 'yum clean all' removes the cached metadata and forces a fresh download, or the cache will expire based on the 'metadata_expire' setting in the repo configuration (default is 6 hours).

Answer

The 'gpgcheck=1' option in the repo file prevents metadata download

Answer

The repository metadata was not signed with a GPG key

Answer

The RPM package version number is lower than the currently installed version

Question 8

Which TWO of the following commands can be used to list all installed packages on a Debian-based system?

Accepted Answer

apt list --installed. `apt list --installed` is a modern APT command that lists all installed packages on Debian-based systems. Option D is correct because `dpkg -l` displays the status and names of all packages known to dpkg, including those installed, effectively listing installed packages.

Answer

apt-get check

Answer

apt-cache showpkg

Answer

dpkg --get-selections

Question 9

Which THREE of the following are valid methods to install a package from a local .deb file?

Accepted Answer

gdebi package.deb. C is correct because `gdebi` is a dedicated tool for installing local `.deb` packages while automatically resolving and fetching their dependencies from configured repositories. It provides a safer alternative to `dpkg` when dependency handling is required.

Answer

alien -i package.deb

Answer

rpm -i package.deb

Question 10

Based on the exhibit, what does the 'rc' status for the package 'apache2-bin' indicate?

Accepted Answer

The package has been removed but configuration files remain. In Debian-based package management (dpkg/APT), the 'rc' status code means the package was marked for removal ('r') but its configuration files were left behind ('c'). This occurs when using 'apt-get remove' or 'dpkg -r' without the --purge option, leaving residual config files in /etc or other locations.

Answer

The package is unpacked but not yet configured

Answer

The package has been completely purged

Answer

The package is installed and configured

Question 11

Based on the exhibit, the 'custom' repository shows 0 packages. What is the most likely cause?

Accepted Answer

The $releasever or $basearch variables are not expanding correctly, leading to an invalid URL. The 'custom' repository shows 0 packages because the $releasever or $basearch variables are not expanding correctly, resulting in an invalid or unreachable repository URL. Yum uses these variables to dynamically construct the baseurl, and if they are undefined or incorrect (e.g., due to a missing or misconfigured /etc/yum/vars/ directory or incorrect release version), the repository metadata cannot be downloaded, so yum reports 0 packages available.

Answer

The repository is disabled because 'enabled=1' is missing

Answer

The GPG key is missing, causing yum to ignore the repository

Answer

The repository metadata is corrupt and needs to be regenerated

Question 12

You are a Linux administrator for a company that uses a custom RPM-based distribution. The development team has built a new version of the internal tool 'monitor-app' (version 2.0) and placed the RPM package in a local YUM repository located at http://internal.repo/monitor-app-2.0.el7.x86_64.rpm. The repository metadata has been updated using 'createrepo'. On a test server running CentOS 7, you run 'yum update monitor-app' but the system reports 'No packages marked for update'. The currently installed version is 1.0. You verify that the repository is enabled and accessible via 'yum repolist'. What is the most likely cause and the correct course of action?

Accepted Answer

Run 'yum list available | grep monitor' to see if the package is listed with a different name, then install it with the exact name. The most likely cause is that the package name in the repository differs from the installed package name (e.g., 'monitor-app' vs. 'monitor-app-2.0'). Running 'yum list available | grep monitor' will reveal the exact package name in the repository, allowing you to install it with the correct name. This is a common scenario when package naming conventions change between versions or when the repository uses a different naming scheme than the installed package.

Answer

Download the RPM and install it locally with 'rpm -Uvh monitor-app-2.0.el7.x86_64.rpm'

Answer

Check the version number in the repository using 'yum info monitor-app' and compare with installed version

Answer

Run 'yum clean all' and then 'yum update monitor-app' again

Question 13

A system administrator needs to install a new kernel on a Debian-based system. Which TWO commands can be used to achieve this? (Choose TWO.)

Accepted Answer

apt-get install linux-image-5.10.0-20-amd64. `apt-get install` is the standard command for installing a specific kernel package from the configured repositories on Debian-based systems. The package name `linux-image-5.10.0-20-amd64` corresponds to a precompiled kernel image that APT will download and install, automatically handling dependencies and updating the bootloader configuration.

Answer

apt-cache search linux-image-5.10.0-20-amd64

Answer

apt-get update

Answer

make install

Question 14

Refer to the exhibit. A system administrator checks the integrity of the passwd package on a CentOS 7 system using rpm -V. Based on the output, what is the most likely cause of the 'missing' line?

Accepted Answer

The file /etc/security/passwd was deleted from the filesystem.. The 'missing' line in the rpm -V output indicates that the file /etc/security/passwd is not present on the filesystem. Since rpm -V verifies file attributes and existence against the RPM database, a missing file means it was deleted after installation. Option D correctly identifies this as the most likely cause.

Answer

The package was updated to a newer version that no longer includes this file.

Answer

The file /etc/security/passwd was modified after installation.

Answer

The package was not installed completely.

Question 15

You are a system administrator for a small company running a web server on Ubuntu 20.04 LTS. The web server application was installed using apt from the official repositories. Recently, a critical security patch was released for the web server package. You run 'apt update' and 'apt upgrade' but the package is not upgraded. You check the package status with 'apt-cache policy <package>' and see that the installed version is 2.4.41-4ubuntu3.6, and the candidate version is the same. The latest patched version in the repository is 2.4.41-4ubuntu3.7. You verify that the system has internet connectivity and that the repository URLs in /etc/apt/sources.list are correct. What is the most likely reason the upgrade is not being offered?

Accepted Answer

Run 'apt-mark unhold ' and then 'apt upgrade'.. The most likely reason is that the package has been placed on hold using 'apt-mark hold', which prevents it from being upgraded even when a newer version is available in the repository. Running 'apt-mark unhold ' removes this hold, allowing 'apt upgrade' to proceed normally.

Answer

Add the universe repository to sources.list and run 'apt update'.

Answer

Use 'apt dist-upgrade' instead of 'apt upgrade'.

Answer

Run 'apt install <package>' which will force the upgrade.

Question 16

Arrange the steps to schedule a cron job that runs a script every day at 2 AM.

Accepted Answer

1. Execute `crontab -e` to open the user's cron file. 2. Add the line `0 2 * * * /path/to/script` to the file. 3. Save and exit the editor. 4. Verify the cron job with `crontab -l`.. Crontab -e opens the user's cron file; the syntax minute hour day month weekday command must be correct.

Answer

1. Execute `crontab -e` to open the user's cron file. 2. Save and exit the editor. 3. Add the line `0 2 * * * /path/to/script` to the file. 4. Verify the cron job with `crontab -l`.

Answer

1. Verify the cron job with `crontab -l`. 2. Execute `crontab -e` to open the user's cron file. 3. Add the line `0 2 * * * /path/to/script` to the file. 4. Save and exit the editor.

Answer

1. Add the line `0 2 * * * /path/to/script` to the file. 2. Execute `crontab -e` to open the user's cron file. 3. Save and exit the editor. 4. Verify the cron job with `crontab -l`.

Question 17

Order the steps to configure a Linux system to use a proxy server for HTTP.

Accepted Answer

Step 1: Set environment variables (http_proxy, https_proxy, no_proxy) in /etc/environment or user shell config. Step 2: Source the config file (e.g., source ~/.bashrc) or log out/in. Step 3: Configure application-specific proxy settings (e.g., apt.conf, /etc/wgetrc). Step 4: Test connectivity using curl or wget.. Proxy configuration involves setting environment variables and application-specific configs.

Answer

Step 1: Configure application-specific proxy settings (e.g., apt.conf). Step 2: Set environment variables in /etc/environment. Step 3: Source the config file. Step 4: Test connectivity.

Answer

Step 1: Set environment variables in a terminal session (export http_proxy=...). Step 2: Configure application-specific settings. Step 3: Test connectivity. Step 4: Do not make settings persistent by saving to config files.

Answer

Step 1: Set environment variables in /etc/environment. Step 2: Test connectivity without sourcing or logging out. Step 3: Configure application-specific settings. Step 4: Reboot the system.

Question 18

Match each Linux directory to its standard purpose.

Accepted Answer

/bin: Essential user command binaries. Correct matches: /bin holds essential binaries, /etc stores system configuration, /var contains variable data. Common confusions arise from swapping purposes: /bin is not for variable data, /etc is not for temporary files, and /var does not hold binaries.

Answer

/bin: Variable data such as logs and spool files

Answer

/etc: Temporary files cleared on reboot

Answer

/var: Essential user command binaries

Question 19

Match each SELinux context component to its purpose.

Accepted Answer

user: Identifies the SELinux user identity. In SELinux, the context format is user:role:type:level. User identifies the SELinux user, role defines accessible roles, type defines domain/object type, and level defines sensitivity/categories. Common confusions include swapping user/role or role/type.

Answer

user: Defines the set of roles that can be accessed

Answer

role: Defines the domain for processes

Question 20

A system administrator needs to install a local Debian package file named 'myapp.deb'. Which command should be used?

Accepted Answer

dpkg -i myapp.deb. The correct command to install a local Debian package file is `dpkg -i myapp.deb`. The `dpkg` tool is the low-level package manager for Debian-based systems that directly handles `.deb` files, and the `-i` flag triggers installation. Unlike `apt-get` or `aptitude`, `dpkg` does not resolve dependencies automatically, but it is the proper tool for installing a standalone `.deb` file from disk.

Answer

rpm -ivh myapp.deb

Answer

aptitude install myapp.deb

Answer

apt-get install myapp.deb