Cannot locate base snap core18

[ah_86]

I made a backup of my system using Timeshift, and updated to Kubuntu 20.10, and I had multiple issues, so I decided to use my backup to rollback to Kubuntu 20.04, but Snap applications stopped working.

I tried to run Glate in the terminal, and I got this error:

cannot locate base snap core18: No such file or directory

And with Citra Nightly I got this error:

cannot locate base snap core20: No such file or directory

• I tried reinstalling snapd, but that did not work.

• I tried to install core18, and core20, but they are already installed.

• I tried to remove core18, but I got this error:
  error: cannot remove "core18": snap "core18" is not removable: snap is being used by snaps glate, gnome-3-28-1804, gnome-3-32-1804, gtk-common-themes, qt513 and 2 more.
  Removing core20 is not possible either
  error: cannot remove "core20": snap "core20" is not removable: snap is being used by snap citra-emu.

• I tried removing Glate, and installing it again, but that does not work.

I can not purge snapd, and installing it again, because that will remove all my Snap application, and their settings, and that includes all the save games of Citra, and I do not know where this application stores its save games exactly to backup them.

The output of snap list:

Name                Version                     Rev   Tracking       Publisher   Notes
citra-emu           C1856-N1628                 53    latest/stable  nightmayr   -
core                16-2.46.1                   9993  latest/stable  canonical✓  core
core18              20200724                    1885  latest/stable  canonical✓  base
core20              20                          634   latest/stable  canonical✓  base
glate               2                           15    latest/stable  keshavnrj   -
gnome-3-28-1804     3.28.0-17-gde3d74c.de3d74c  128   latest/stable  canonical✓  -
gnome-3-32-1804     0+git.635fbdc               97    latest/stable  canonical✓  -
gtk-common-themes   0.1-36-gc75f853             1506  latest/stable  canonical✓  -
gtk2-common-themes  0.1                         13    latest/stable  canonical✓  -
qt513               5.13                        19    latest/stable  keshavnrj   -
qt551               5.5                         30    latest/stable  keshavnrj   -
snapd               2.46.1                      9279  latest/stable  canonical✓  snapd
spek                0.8.3-105-gf071c29          43    latest/stable  popey       -

The output of snap version:

snap    2.46.1+20.04
snapd   2.46.1+20.04
series  16
ubuntu  20.04
kernel  5.8.12-050812-generic

[Lin-Buo-Ren]

@ah_86

I do not know where this application stores its save games exactly to backup them.

Try looking it under ~/snap

[ogra]

use the snapshots feature to store games and game data:

Snapshots

A snapshot is a copy of the user, system and configuration data stored by snapd for one or more snaps on your system. This data can be found in $HOME/snap/<snap-name> and /var/snap/<snap-name>. Snapshots are generated manually with the snap save command and automatically when a snap is removed (unless --purge is used with remove, in which case no snapshot is created). A snapshot can be used to backup the state of your snaps, revert snaps to a previous state and to restore a fresh snapd installa…

[ah_86]

I figured out where Citra keeps its settings, and save games, and where Citra (Snap) save its settings, and save games. I made a backup, and I will purge Snap, and build these applications from source instead

It will be nice if Snaps can be repaired instead of purging everything, and installing all the applications again.