Snap module update command hangs with SNAP 7.0

I updated SNAP to 7.0 in a simple Docker recipe built on Debian ( The recipe used to work fine for 6.0 and included module update with

snap --nosplash --nogui --modules --update-all

in accordance with the docs.

However, that command produces the following output:

snap --nosplash --nogui --modules --update-all
/usr/local/snap/bin/../platform/lib/nbexec: WARNING: environment variable DISPLAY is not set
Refreshing SNAP Community Extensions
Refreshing SNAP
Refreshing SNAP Extensions
Updates not found.

and then it hangs forever, i.e. never returns and with it the rest of the build process.

Is that a bug or a transient issue like Error updating snap command line?

Hi Jonas,
that’s a known issue and mentioned at the top of the Update SNAP from the command line wiki page.
There is also a workaround mentioned.

Ah. Unfortunately I cannot follow the link to the workaround, because the issues on the snap-desktop GitHub repo are not visible for me: Could you re-post the script here or put it in a public Gist or so, please?

1 Like

Same issue. I would appreciate it here as well

Mmh, even for me it wasn’t visible anymore.

This is what was provided as workaround:

Given one has pkill installed (should be available in macOS most Linux distros by default, not sure about other BSDs though) and uses the JRE that comes with SNAP, a very crude workaround is:

snap --nosplash --nogui --modules --update-all 2>&1 | while read -r line; do
    echo "$line"
    [ "$line" = "updates=0" ] && sleep 2 && pkill -TERM -f "snap/jre/bin/java"

This will terminate the Java process the SNAP update launched when the line “updates=0” is printed.