5 Aug
2020
5 Aug
'20
5:34 p.m.
Anno domini 2020 Wed, 5 Aug 19:29:49 +0200
Slávek Banko scripsit:
Dne st 5. srpna 2020 Dr. Nikolaus Klepp napsal(a):
Metapackages are good at installation, but poor servant during the removal
of individual packages.
For metapackages to work well for installation, there is a need for a hard
dependency - Depends. If a looser dependency - Recomends - were used, the
result could be that virtually nothing would be installed when the default
apt setting is "without recommends". And here is the beginning of the
problem. If a user wants to remove a package that is referenced by a
metapackage, this will cause the metapackage to break => leads to its
uninstallation and thus to the uninstallation of all other packages
referenced by the metapackage.
Therefore, before removing a metapackage, all referenced packages need to
be switched to "manual" so that they are retained even if the metapackage
is removed. This is more difficult to do manually with commands - it's
much easier to use aptitude.
How do you do that with aptitude?
nik
root@local [~]# apt-mark manual tde-trinity tdeutils-trinity
tde-trinity was already set to manually installed.
tdeutils-trinity set to manually installed.
root@local [~]# apt-get purge klaptopdaemon-trinity
{snip}
The following packages were automatically installed and are no longer
required:
amor-trinity arts-trinity {snip} twin4-trinity xcalib
Use 'apt autoremove' to remove them.
The following packages will be REMOVED:
klaptopdaemon-trinity* tde-trinity* tdeutils-trinity*
0 upgraded, 0 newly installed, 3 to remove and 3 not upgraded.
After this operation, 840 kB disk space will be freed.
Do you want to continue? [Y/n] n
Abort.
The metapackgs can be removed without any problem.
And that's exactly why we like aptitude. Aptitude is much more powerful and
skillful than Synaptic. And just as useful as apt-get / apt-cache /
apt-<something> or apt.
Cheers
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