How to run snap applications under Ubuntu 18.04?

Question

linux

# snap list
Name                  Version    Rev   Tracking  Publisher     Notes
core                  16-2.37.2  6405  stable    canonical✓    core
core18                18         731   stable    canonical✓    base
gimp                  2.10.8     130   stable    snapcrafters  -
gnome-3-26-1604       3.26.0     78    stable/…  canonical✓    -
gnome-calculator      3.30.1     260   stable/…  canonical✓    -
gnome-characters      3.30.0     139   stable/…  canonical✓    -
gnome-logs            3.30.0     45    stable/…  canonical✓    -
gnome-system-monitor  3.30.0     57    stable/…  canonical✓    -
mailspring            1.5.7      326   stable    foundry376✓   -
sublime-text          3176       44    stable    snapcrafters  classic
termius-app           4.1.2      28    stable    termius       -

Calculator, system monitor, sublime - work.
And the installed termius-app, mailspring - no. They just don't launch. When run from the command line, it immediately exits without showing any logs. How to make these applications work?