5 Aug
2020
5 Aug
'20
5:44 p.m.
Dne st 5. srpna 2020 Dr. Nikolaus Klepp napsal(a):
Anno domini 2020 Wed, 5 Aug 19:29:49 +0200
Slávek Banko scripsit:
In aptitude you can "enter" the metapackage using the Enter key, move to
depends and then press "m". This will switch all packages in the list
to "manual".
At the same time, there is an 'overview step' in aptitude before performing
both installation and uninstallation - after pressing 'g'. There it is
possible to notice the situation and make changes in the selection of
packages. Alternatively, go back - by pressing 'q' and continue
selecting / deselecting packages.
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?
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. nik
> 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
Cheers
--
Slávek