The correct next step is to use `apt-file search libbar.so.2` on Debian-based systems or `dnf provides libbar.so.2` on Red Hat-based systems to identify which package supplies the missing library file. This is the most appropriate action because the error message indicates a specific file is absent, and package managers track which installed or available packages own each file; searching the repository metadata directly pinpoints the source package without guesswork. On the LPIC-1 exam, this scenario tests your understanding of package dependency resolution and the distinction between package management tools—a common trap is to immediately run `ldconfig` or attempt a forced install, which bypasses the root cause. Remember that `apt-file` and `dnf provides` are your forensic tools for file-to-package mapping, while `apt-get install` or `yum install` are for installation after identification. A useful memory tip: think of the command as a “reverse lookup” for files, just as a phone book reverse lookup finds a name from a number.
LPIC-1 Linux Installation and Package Management Practice Question
This LPIC-1 practice question tests your understanding of linux installation and package management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Run 'ldconfig' to update the library cache
Why it's wrong here
ldconfig does not install missing libraries.
✗
Reinstall the 'foo' package using 'rpm -i --force foo.rpm'
Why it's wrong here
Force install may break the system.
✗
Run 'rpm -q --whatrequires libbar.so.2'
Why it's wrong here
Shows packages requiring the library, not providing it.
✓
Use 'apt-file search libbar.so.2' or 'dnf provides libbar.so.2' to find the package that contains the file
Why this is correct
Identifies the package providing the missing library.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'ldconfig' (which only updates the cache for already-installed libraries) with a tool that can resolve missing dependencies, or they may think that forcing installation with '--force' is an acceptable workaround, when in fact it bypasses safety checks and can lead to system instability.
Trap categories for this question
Command / output trap
Shows packages requiring the library, not providing it.
Detailed technical explanation
How to think about this question
Under the hood, package managers maintain a local database of installed packages and their metadata. When a dependency like 'libbar.so.2' is missing, the package manager cannot proceed because it enforces dependency resolution at install time. Commands like 'apt-file' or 'dnf provides' work by searching the remote repository index (e.g., Contents files for apt, repomd for dnf) to map file paths to package names. In real-world scenarios, this is critical when a library is split into a separate '-devel' or '-libs' subpackage, and the administrator must identify and install the correct subpackage.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the LPIC-1 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Linux Installation and Package Management — This question tests Linux Installation and Package Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this LPIC-1 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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