$ sudo snap remove ubuntu-calculator-app
2016-05-22T11:59:28+01:00 ERROR cannot remove snap file "ubuntu-calculator-app", will retry: [stop snap-ubuntu\x2dcalculator\x2dapp-5.mount] failed with exit status 1: Job for snap-ubuntu\x2dcalculator\x2dapp-5.mount failed. See "systemctl status "snap-ubuntu\\x2dcalculator\\x2dapp-5.mount"" and "journalctl -xe" for details.

2016-05-22T12:04:28+01:00 ERROR cannot remove snap file "ubuntu-calculator-app", will retry: [stop snap-ubuntu\x2dcalculator\x2dapp-5.mount] failed with exit status 1: Job for snap-ubuntu\x2dcalculator\x2dapp-5.mount failed. See "systemctl status "snap-ubuntu\\x2dcalculator\\x2dapp-5.mount"" and "journalctl -xe" for details.

[/] Remove snap "ubuntu-calculator-app" from the system