The correct answer is to run `ldconfig` because the error indicates the dynamic linker cannot locate `libgnutls.so.30` at runtime, even though the `libgnutls` package is installed. This happens when the library path is not set or the linker cache is outdated; `ldconfig` rebuilds the cache by scanning standard directories and updating symbolic links, resolving the "cannot open shared object file" error for Samba. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of the dynamic linker and runtime library resolution—a common trap is assuming a missing package when the library is actually present but uncached. Remember that `ldconfig` is the go-to fix for shared library path issues after installation, not reinstalling the package. A helpful memory tip: "Libraries need a map—`ldconfig` updates the cache to close the gap."
XK0-005 Troubleshooting Practice Question
This XK0-005 practice question tests your understanding of troubleshooting. 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 junior administrator reports that users cannot connect to a file server running Samba. The server is reachable via ping. Logs from the Samba service show: 'smbd: error while loading shared libraries: libgnutls.so.30: cannot open shared object file: No such file or directory'. The administrator confirms the package 'libgnutls' is installed. Which of the following is the most likely cause and solution?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The library path is not set; run ldconfig.
The error 'cannot open shared object file' indicates that the dynamic linker cannot find the libgnutls.so.30 library at runtime, even though the libgnutls package is installed. Running `ldconfig` updates the linker cache, which rebuilds the mapping of shared library names to their actual file paths, resolving the missing library reference for Samba.
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.
✓
The library path is not set; run ldconfig.
Why this is correct
Correct: ldconfig updates the shared library cache, resolving the missing library error.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The system libraries are out of sync; run apt-get update.
Why it's wrong here
Incorrect: apt-get update only updates package lists, not the library cache.
✗
The Samba package is corrupted; reinstall Samba.
Why it's wrong here
Incorrect: The package is installed; the issue is the library cache, not corruption.
✗
The Samba service is not running; restart it.
Why it's wrong here
Incorrect: The error occurs during startup; restarting will repeat the failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see 'package is installed' and assume the library is available, overlooking the need to update the linker cache with `ldconfig` after installation.
Detailed technical explanation
How to think about this question
The dynamic linker/loader (`ld.so`) uses a cache file (`/etc/ld.so.cache`) to locate shared libraries at runtime. When a library is installed but not registered in this cache, `ldconfig` must be run to rebuild it. In real-world scenarios, this often occurs after a manual library installation or an incomplete package upgrade, where the library file exists but the cache is stale.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The library path is not set; run ldconfig. — The error 'cannot open shared object file' indicates that the dynamic linker cannot find the libgnutls.so.30 library at runtime, even though the libgnutls package is installed. Running `ldconfig` updates the linker cache, which rebuilds the mapping of shared library names to their actual file paths, resolving the missing library reference for Samba.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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