Ubuntu 18.04 LTS : Can't open snapstore gui

Okay here's how I solved the issue.

I installed snap-store from Ubuntu Software Centre and after that the issue mentioned in question.

Solution

  1. Uninstall snap-store GUI from terminal (snap remove snap-store).
  2. Install using snap command in terminal (snap install snap-store).
  3. Open snap-store via terminal or apps (snap-store).

You may need to use sudo befare each command above to work. Done