Ubuntu – Snap refuses to launch applications

snap

I’ve installed vscode and vlc via snap commands and each time I launch them from the terminal, I got this message:

snap-confine has elevated permissions and is not confined but should
be. Refusing to continue to avoid permission escalation attacks

Any help please!

Best Answer

These steps help me resolve permanently my problem:

Remove snapd: sudo apt purge snapd snap-confine
Update: sudo apt update
Reinstall it: sudo apt install snapd
Check apparmor's status: systemctl status apparmor
If status inactive, then activate it: systemctl start apparmor
Now install any app you want via snap commands line

Remember, you must check and activate apparmor before installing any app.

Snap problem

I got similar error message on 16.04 LTS MATE with Xorg:

$ cat /etc/os-release | grep PRETTY
PRETTY_NAME="Ubuntu 16.04.3 LTS"

$ export | grep XDG_SESSION
declare -x XDG_SESSION_DESKTOP="mate"
declare -x XDG_SESSION_ID="c2"
declare -x XDG_SESSION_PATH="/org/freedesktop/DisplayManager/Session0"
declare -x XDG_SESSION_TYPE="x11"

$ snap list | grep notepadqq
notepadqq  1.2.0-2    115   danieleds  -

$ which notepadqq 
/snap/bin/notepadqq

$ sudo snap run notepadqq
mkdir: cannot create directory '/run/user/0': Permission denied
No protocol specified
QXcbConnection: Could not connect to display :0.0
Aborted (core dumped)

$ pkexec snap run notepadqq
mkdir: cannot create directory '/run/user/0': Permission denied
QXcbConnection: Could not connect to display 
Aborted (core dumped)

$ sudo notepadqq 
mkdir: cannot create directory '/run/user/0': Permission denied
No protocol specified
QXcbConnection: Could not connect to display :0.0
Aborted (core dumped)

$ gksudo notepadqq 
No protocol specified
QXcbConnection: Could not connect to display :0.0

$ sudo -u www-data notepadqq /var/www/html/index.html 
2018/02/25 22:40:11.162682 cmd_run.go:562: WARNING: cannot create user data directory: cannot create "/var/www/snap/notepadqq/115": mkdir /var/www/snap: permission denied
cannot create user data directory: /var/www/snap/notepadqq/115: Read-only file system

So it is not Wayland issue.

May be it is other limitation of Snap. Anyway I reported bug 1751634 to launchpad.

Get deb-packaged Notepadqq and run it

We discovered, that notepadqq snap does not launch as root, so we

Removing it and installing normal version from “Notepadqq Team” team PPA

snap remove notepadqq
sudo add-apt-repository -y ppa:notepadqq-team/notepadqq
sudo apt-get update
sudo apt-get install notepadqq

Then run it as normal user:
```
notepadqq
```
And as root:
```
gksudo notepadqq
```

Hope this helps.

Best Answer

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Snap problem

Get deb-packaged Notepadqq and run it

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