Cant start any snap application on Xenial

[Björn Michaelsen]

On my Xenial machine I dont succeed to start any snap application.

steps to reproduce:
1/ sudo snap install hello-world
2/ /snap/bin/hello-world

expected behaviour:
prints "hello world"

actual behaviour:
cannot bind mount nvidia driver /usr/lib/nvidia-340 -> /tmp/snap.rootfs_AmrBLJ/var/lib/snapd/lib/gl. errmsg: No such file or directory

The same happens when I try to start the LibreOffice snap, so I expect it to be a general problem.

Before this happened, I aborted an libreoffice snap download -- which apparently left snapd in a broken state. Thus I ran:

 https://github.com/zyga/devtools/blob/master/reset-state

Which on first look seemed to have fixed things: I could again install snaps. However it (still? or because of 'reset-state'/something breaking by the aborted download) does not run any snap app.
Versions:
 snapd 2.16ubuntu3
 uname -a
 Linux XXX 4.4.0-45-generic #66-Ubuntu SMP Wed Oct 19 14:12:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

[Zygmunt Krynicki (zyga)]

Did you install or remove your nvidia driver lately?

[Zygmunt Krynicki (zyga)]

Dear reporter, can you please try "snap-confine" 1.0.44 from xenial-proposed?

[Zygmunt Krynicki (zyga)]

can you please tell me the output of "snap list"?

[Zygmunt Krynicki (zyga)]

I'm boarding a plane now but I suspect that you don't have a working core snap. I'll work with you on figuring out the problem next week.

[Kyle Fazzari (kyrofa)]

Zygmunt,

I have the exact same problem here:

    $ hello-world.env
    cannot bind mount nvidia driver /usr/lib/nvidia-340 -> /tmp/snap.rootfs_UfGDpF/var/lib/snapd/lib/gl. errmsg: No such file or directory

snap-confine 1.0.44-0ubuntu1~16.04 from proposed changes nothing. The output of snap list follows:

    $ snap list
    Name Version Rev Developer Notes
    hello-world 6.3 27 canonical -
    ubuntu-core 16.04.1 1111 canonical -

[Kyle Fazzari (kyrofa)]

Note that the 1111 was the edge channel for ubuntu core. Same problem on stable, where snap list shows this:

    $ snap list
    Name Version Rev Developer Notes
    hello-world 6.3 27 canonical -
    ubuntu-core 16.04.1 423 canonical -

[Kyle Fazzari (kyrofa)]

Note that I also used the reset-state script, after which this happened. It worked before that.

[Kyle Fazzari (kyrofa)]

Alright, I just purged snapd and snap-confine and reinstalled. Things are working again.

[Björn Michaelsen (bjoern-michaelsen)]

FWIW, snaps work again for me too on xenial. Cant pinpoint when that happened.