sideloaded kernel.snap cannot be removed

[Gunther Laure]

I try to install a sideloaded kernel.

sudo snap install livecd.ubuntu-core.kernel.snap
[|] Copy snap "canonical-pc-linux" data

then reboot

After reboot I try to remove the kernel again:
sudo snap remove livecd.ubuntu-core.kernel.snap
error: can't remove "livecd.ubuntu-core.kernel.snap": cannot find snap "livecd.ubuntu-core.kernel.snap"

or

sudo snap remove canonical-pc-linux
error: can't remove "canonical-pc-linux": cannot find mounted snap "canonical-pc-linux" at revision 100001

ubuntu@localhost:~$ sudo snap changes
ID Status Spawn Ready Summary
1 Done 2016-04-19T14:15:20Z 2016-04-19T14:15:20Z Install "/tmp/snapd-sideload-pkg-559884458" snap file
2 Hold 2016-04-19T14:20:02Z - Remove "livecd.ubuntu-core.kernel.snap" snap
3 Hold 2016-04-19T14:20:07Z - Remove "livecd.ubuntu-core.kernel" snap
4 Hold 2016-04-19T14:20:10Z - Remove "livecd.ubuntu-core" snap
5 Error 2016-04-19T14:20:21Z 2016-04-19T14:20:21Z Install "/tmp/snapd-sideload-pkg-074330792" snap file
6 Error 2016-04-19T14:37:03Z 2016-04-19T14:37:03Z Install "/tmp/snapd-sideload-pkg-505839793" snap file
7 Hold 2016-04-19T14:37:27Z - Remove "canonical-pc-linux" snap
8 Hold 2016-04-19T14:39:27Z - Remove "livecd.ubuntu-core.kernel.snap" snap
9 Hold 2016-04-19T14:40:03Z -

Reinstallation also fails:
sudo snap install livecd.ubuntu-core.kernel.snap

error: cannot perform the following tasks:
- Mount snap "canonical-pc-linux" (cannot find mounted snap "canonical-pc-linux" at revision 100001)

[Michael Vogt (mvo)]

Could you please check if you have version snapd 2.0.2 on your system? I.e. run $ grep snapd /usr/share/snappy/dpkg.list

There was a bug that made mount units not persist accross reboots in versions < 2.0.2. I close this bug but please reopen if you can reproduce this on an image with snapd 2.0.2

[Gunther Laure (gunther-laure-e)]

The previous issue was related to snapd 2.0.2 but the bug is still not resolved.

It is not possible to remove any (sideloaded) kernel snap:

ubuntu@localhost:~$ sudo snap remove trionet-kernel
error: can't remove "trionet-kernel": snap "trionet-kernel" is not removable

or:

ubuntu@localhost:~$ sudo snap remove canonical-pc-linux
error: can't remove "canonical-pc-linux": snap "canonical-pc-linux" is not removable
(I did sideload the canonical-pc-linux kernel).

snap changes
ID Status Spawn Ready Summary
1 Done 2016-04-21T06:10:05Z 2016-04-21T06:10:06Z Install "/tmp/snapd-sideload-pkg-883084797" snap file
2 Hold 2016-04-21T06:11:14Z - Remove "livecd.ubuntu-core.kernel.snap" snap
3 Hold 2016-04-21T06:11:36Z - Remove "canonical-pc-linux" snap
4 Done 2016-04-21T06:12:20Z 2016-04-21T06:12:20Z Install "/tmp/snapd-sideload-pkg-590380053" snap file
5 Done 2016-04-21T06:15:01Z 2016-04-21T06:15:01Z Install "/tmp/snapd-sideload-pkg-163806372" snap file
6 Hold 2016-04-21T06:16:25Z - Remove "trionet-kernel" snap
7 Hold 2016-04-21T06:17:23Z - Remove "5" snap
8 Hold 2016-04-21T06:22:10Z - Remove "trionet-kernel" snap
9 Done 2016-04-21T06:23:41Z 2016-04-21T06:23:41Z Install "/tmp/snapd-sideload-pkg-529827863" snap file
10 Hold 2016-04-21T06:23:45Z - Remove "trionet-kernel" snap
11 Hold 2016-04-21T06:23:56Z - Remove "canonical-pc-linux" snap

ubuntu@localhost:~$ snap changes 9
Status Spawn Ready Summary
Done 2016-04-21T06:23:41Z 2016-04-21T06:23:41Z Prepare snap "/tmp/snapd-sideload-pkg-529827863"
Done 2016-04-21T06:23:41Z 2016-04-21T06:23:41Z Mount snap "trionet-kernel"
Done 2016-04-21T06:23:41Z 2016-04-21T06:23:41Z Make current revision for snap "trionet-kernel" unavailable
Done 2016-04-21T06:23:41Z 2016-04-21T06:23:41Z Copy snap "trionet-kernel" data
Done 2016-04-21T06:23:41Z 2016-04-21T06:23:41Z Setup snap "trionet-kernel" security profiles
Done 2016-04-21T06:23:41Z 2016-04-21T06:23:41Z Make snap "trionet-kernel" available to the system

ubuntu@localhost:~$ snap changes 10
Status Spawn Ready Summary

ubuntu@localhost:~$ snap changes 11
Status Spawn Ready Summary

grep snapd /usr/share/snappy/dpkg.list
ii snapd 2.0.2 amd64 Tool to interact with Ubuntu Core Snappy.
ii ubuntu-core-snapd-units 2.0.2 amd64 Scripts for snapd that should only run on ubuntu core systems.