cannot update preserved namespace of snap

Hi, thank you for reporting this. You mentioned you couldn't revert the snap, but the command you pasted is for a refresh. Does `snap revert --revision=131 discord` work? Could you paste the output of `snap version` please? Could you also run `snap changes`, take the ID of the failed refresh, run `snap change <ID>` with it and paste the output here? Thank you for your help.

I don't think I can reproduce this anymore. I removed/purged and reinstalled it. I also can't seem to install arbitrary revisions.
It works fine now. : \
Sorry and thanks for trying to help.
Feel free to close this.

I have encountered today. Discord did an auto refresh then refused to load because of a missing gnome connection. I tried to refresh it again and got this message. If reinstalling fixes it I will do that.

$ snap connections discord
Interface Plug Slot Notes
audio-playback discord:audio-playback :audio-playback -
audio-record discord:audio-record :audio-record -
camera discord:camera :camera manual
content discord:gnome-3-38-2004 - -
content[gtk-3-themes] discord:gtk-3-themes gtk-common-themes:gtk-3-themes -
content[icon-themes] discord:icon-themes gtk-common-themes:icon-themes -
content[sound-themes] discord:sound-themes gtk-common-themes:sound-themes -
desktop discord:desktop :desktop -
desktop-legacy discord:desktop-legacy :desktop-legacy -
gsettings discord:gsettings :gsettings -
home discord:home :home -
mount-observe discord:mount-observe - -
network discord:network :network -
network-observe discord:network-observe - -
opengl discord:opengl :opengl -
process-control discord:process-control :process-control manual
removable-media discord:removable-media - -
screen-inhibit-control discord:screen-inhibit-control :screen-inhibit-control -
shared-memory discord:shmem - -
system-observe discord:system-observe :system-observe manual
wayland discord:wayland :wayland -
x11 discord:x11 :x11 -

$ sudo snap refresh discord
error: cannot perform the following tasks:
- Setup snap "discord" (137) security profiles (cannot update mount namespace of snap "discord": cannot update preserved namespace of snap "discord": cannot update snap namespace: remove /usr/bin/gjs: read-only file system)
$ snap version
snap 2.56
snapd 2.56
series 16
ubuntu 22.04
kernel 5.15.0-37-generic

Not sure I totally understand how the namespace is effecting this, but I had the same error when trying to run `snap refresh`, which initially failed but was fixed by running `snap-discard-ns`:

$ sudo snap refresh
error: cannot perform the following tasks:
- Setup snap "discord" (137) security profiles (cannot update mount namespace of snap "discord": cannot update preserved namespace of snap "discord": cannot update snap namespace: remove /usr/bin/gjs: read-only file system)
$ sudo /usr/lib/snapd/snap-discard-ns discord
$ sudo snap refresh
discord 0.0.18 from Snapcrafters refreshed

This was based on similar advice for the GIMP snap, mentioned here:
https://forum.snapcraft.io/t/gimp-broken/17958/4

I encountered all this after getting a notification in GNOME top bar that read in part:

> pending update of snap "discord" close the app to avoid disruption

Let me know if I can provide any other info that can help.

I had the same problem and I solved it using the commands provided by gaehj457. Thanks!

Same with mattermost-desktop.

$ sudo snap refresh
error: cannot perform the following tasks:
- Setup snap "mattermost-desktop" (514) security profiles (cannot update mount namespace of snap "mattermost-desktop": cannot update preserved namespace of snap "mattermost-desktop": cannot update snap namespace: remove /usr/bin/gjs: read-only file system)

$ sudo /usr/lib/snapd/snap-discard-ns mattermost-desktop

$ sudo snap refresh
mattermost-desktop 5.1.0 from Snapcrafters refreshed

I encountered this with spotify today.

```
sudo /usr/lib/snapd/snap-discard-ns spotify
```

fixed it.

Same behaviour with spotify

$ snap list spotify
Name Version Rev Tracking Publisher Notes
spotify 1.1.84.716.gc5f8b819 60 latest/stable spotify✓ -

$ snap refresh spotify
error: cannot perform the following tasks:
- Setup snap "spotify" (63) security profiles (cannot update mount namespace of snap "spotify": cannot update preserved namespace of snap "spotify": cannot update snap namespace: remove /usr/bin/gjs: read-only file system)

$ ps -elf | grep bin/gjs
0 S user 7331 6555 0 80 0 - 733443 do_pol mar28 ? 00:00:04 /usr/bin/gjs /usr/share/gnome-shell/org.gnome.Shell.Notifications
0 S user 9425 6555 0 80 0 - 716553 do_pol mar28 ? 00:00:00 /usr/bin/gjs /usr/share/gnome-shell/org.gnome.ScreenSaver

$ sudo /usr/lib/snapd/snap-discard-ns spotify
[sudo] password for user:

$ snap refresh spotify
spotify 1.2.8.923.g4f94bf0d from Spotify✓ refreshed