Ubuntu – How to update all Snap packages

Note that sudo isn't necessary. snap find and snap install will work just fine without it.

snap find only shows promoted and public snaps in the stable channel. By curating snaps in this way, users can expect a degree of quality when using snap find for app discovery.

If you'd like to know all the snaps that exist, try uappexplorer:

$ snap install uappexplorer-cli
$ uappexplorer-cli --type snap
┌────────────────────┬───────────────────────────┬───────────────┬──────┬──────┐
│ App                │ Description               │ Type          │ ❤    │ ★    │
├────────────────────┼───────────────────────────┼───────────────┼──────┼──────┤ 
│ test-snapd-cups-c… │ A basic snap declaring a… │ Snap          │ 0    │ 0    │
├────────────────────┼───────────────────────────┼───────────────┼──────┼──────┤ 
│ test-snapd-fuse-c… │ A basic snap declaring a… │ Snap          │ 0    │ 0    │
├────────────────────┼───────────────────────────┼───────────────┼──────┼──────┤ 
│ lcavassa-iperf     │ A TCP, UDP, and SCTP net… │ Snap          │ 0    │ 0    │
├────────────────────┼───────────────────────────┼───────────────┼──────┼──────┤ 
│ deadbeef-vs        │ The Ultimate Music Playe… │ Snap          │ 0    │ 0    │
├────────────────────┼───────────────────────────┼───────────────┼──────┼──────┤ 

This was the top search item for the topic as I was trying to remove a snap whilst it was "auto-refreshing". The better answer in that it allows you to stop the refresh and take action is covered in Ask Ubuntu.

In effect:

# Check for snap changes
sudo snap changes

# This will list something like
ID         Status   Spawn                  Ready   Summary
<number>   Doing    today at 10:58 CEST    -       Auto-refresh snap <snap_program>

# Note the ID for the refresh and abort it
sudo snap abort <number>

# You must check changes until it has been actioned
sudo snap changes

# This will now list something like
ID         Status   Spawn                  Ready   Summary
<number>   Error    today at 10:58 CEST    -       Auto-refresh snap <snap_program>

# The take remedial action, in my case remove
sudo snap remove <snap_program>

Tested with microk8s on Ubuntu 18.04 and chromium on Ubuntu 20.04.