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Re: disk usage for /usr/lib on bullseye

On 2/5/23 18:20, Bret Busby wrote:

On 2/5/23 18:18, Bret Busby wrote:

On 2/5/23 17:18, Tixy wrote:

On Tue, 2023-05-02 at 17:03 +0800, Bret Busby wrote:

On 2/5/23 16:58, Bret Busby wrote:

On 2/5/23 11:42, David Wright wrote:


<snip>




Have you tried running also
apt autoclean


I thought that just cleared /var/cache/apt/archives/.


and
apt purge


I've never tried that without a package name. What does it do?



RTFM ?



man apt


Which doesn't say what 'apt purge' does without a package name. It says
'Performs the requested action on one or more packages specified via
regex(7), glob(7) or exact match'. It doesn't go on to say what happens
if you leave that blank. 3 possibilities that spring to mind is that
this is and error, a noop, or means 'every package'. The latter you be
real bad, the other two now a useful suggestion to people. Of course,
it could be special cased to mean 'purge everything not installed',
which count be useful, but the man page doesn't say that.


"
install, reinstall, remove, purge (apt-get(8))
            Performs the requested action on one or more packages specified via regex(7), glob(7) or exact match. The requested action can be overridden for specific packages by             appending a plus (+) to the package name to install this package or a minus (-) to remove it.
            A specific version of a package can be selected for installation by following the package name with an equals (=) and the version of the package to select. Alternatively the             version from a specific release can be selected by following the package name with a forward slash (/) and codename (bullseye, bookworm, sid ...) or suite name (stable,             testing, unstable). This will also select versions from this release for dependencies of this package if needed to satisfy the request.
            Removing a package removes all packaged data, but leaves usually small (modified) user configuration files behind, in case the remove was an accident. Just issuing an             installation request for the accidentally removed package will restore its function as before in that case. On the other hand you can get rid of these leftovers by calling             purge even on already removed packages. Note that this does not affect any data or configuration stored in your home directory. 
"

I expect that, by context, running
apt purge
without the restriction specifying particular package, will apply
apt purge
to all installed packages, according to what purge does, in relation to packages. 




I had meant to include (but forgot to include) in the above message;
perhaps, if reading this, a package developer/maintainer for apt could clarify the above.
However, in reading the man entry for apt, further, I am of the impression that what 
apt purge
does, is removes redundant configuration files, rather than redundant dependencies (which, I take to include libraries). 

So, given

"
  autoremove (apt-get(8))
autoremove is used to remove packages that were automatically installed to satisfy dependencies for other packages and are now no longer needed as dependencies changed or the 
           package(s) needing them were removed in the meantime.
You should check that the list does not include applications you have grown to like even though they were once installed just as a dependency of another package. You can mark such a package as manually installed by using apt-mark(8). Packages which you have installed explicitly via install are also never proposed for automatic removal. 
"

I expect that, as
apt autoremove
removes redundant kernels (and "packages that were automatically installed to satisfy dependencies for other packages and are now no longer needed as dependencies changed or the package(s) needing them were removed in the meantime"), that apt autoremove should also remove redundant libraries, which goes to the query of the original poster. 

If
apt autoremove
does not remove orphaned (as in redundant, because the "packages that were automatically installed to satisfy dependencies for other packages and are now no longer needed as dependencies changed or the package(s) needing them were removed in the meantime") libraries, then, perhaps, 
apt autoremove has a slight deficiency?

..
Bret Busby
Armadale
West Australia
(UTC+0800)
..............
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