This issue still exists in 17.04, with a few differences:
* The snap is called "core" and not "ubuntu-core"
* sudo snap remove core - returns the same message as above: snap "core" is not
removable
* However, trying to umount "core" fails if snapd.service is running
My fix was to:
(1) use 'df' to find the mount point of "/snap/core/*"
(2) stop the snap service
(3) umount /snap/core/xxxx
(4) start snap service
(5) use snap remove core - which then worked
---
Here's the abbreviated output
$ snap list
Name Version Rev Developer Notes
core 16-2.26.14 2462 canonical -
$ df # use output to find the mount point "/snap/core/xxxx"
$ sudo umount /snap/core/2462 # this failed on my system, unlike poster above
umount: /snap/core/2462: target is busy
...
$ sudo systemctl stop snapd
Warning: Stopping snapd.service, but it can still be activated by: snapd.socket
$ sudo umount /snap/core/2462 # umount worked with snapd stopped
$ sudo systemctl start snapd # start snapd again in order to use
'snap remove' command
$ df # verify that starting the snap service didn't remount "core" (it didn't)
...
{"/snap/core/xxxx" not listed}
...
$ sudo snap remove core # success!
core removed
---
Verify Removal:
$ sudo snap list
No snaps are installed yet. Try "snap install hello-world"
$ ls -l /snap/core
...
{nothing listed}
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https://bugs.launchpad.net/bugs/1589210
Title:
snap remove "core" on classic not allowed
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