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MigrationBot: Import from cypat.guide: docs/linux/application_updates/intermediate_application_updates.md

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Import from cypat.guide: docs/linux/application_updates/intermediate_application_updates.md

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Author(s): Matthias Lee (ml2322) <br /> Last Updated: 8-13-2025

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{| class="mw-collapsible mw-collapsed wikitable" style="width:100%"
! Recommended Prerequisites (click to expand)
|-
|

* Intro application updates

|}

=== Some problems with apt update/upgrade ===

Using <code>apt update</code> and <code>apt upgrade</code> will work ~95% of the time to update software. However, there are a few things that can prevent apps from being updated like this.

==== Held Packages ====

APT includes a feature called <code>hold</code>. Packages marked as held will be kept at their current version and not updated even if a new version is available. To find all held apt packages, we can use <code>apt-mark</code>:

<syntaxhighlight lang="text">user@system:~$ sudo apt-mark showhold</syntaxhighlight>
If there are any held packages, you can unhold them with <code>apt-mark</code> like so:

<syntaxhighlight lang="text">user@system:~$ sudo apt-mark unhold xyz</syntaxhighlight>
After this, you can do <code>apt update</code> and <code>apt upgrade</code> again, and the previously-held package will be updated.

<syntaxhighlight lang="text">user@system:~$ sudo apt update
...
user@system:~$ sudo apt upgrade
...</syntaxhighlight>
==== Incomplete sources ====

When you run <code>sudo apt update</code> to update apt's sources, it is fetching the package lists from APT repositories listed in <code>/etc/apt/sources.list</code> If this list is missing some repositories, APT won't be able to fetch all of the updates. Every distro has different default sources, so you'll need to use something like the website in Further Reading to find the default sources.list for your distro. Once you find that, ensure that yours contains all the same lines and nothing is commented out that shouldn't be. Once that's fixed, update your apt sources and upgrade.

<syntaxhighlight lang="text">user@system:~$ sudo apt update
...
user@system:~$ sudo apt upgrade
...</syntaxhighlight>
====== Further Reading ======

* https://first2host.co.uk/blog/default-ubuntu-sources-list/
* https://askubuntu.com/questions/640986/how-to-get-a-list-of-installed-packages-held-back-from-upgrade
* https://askubuntu.com/questions/18654/how-to-prevent-updating-of-a-specific-package

[[Category:Linux Application Updates|029]]
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MigrationBot: Import from cypat.guide: docs/linux/application_updates/intermediate_application_updates.md