I have reinstalled (by Synaptic Package Manager) - libsnapd-glib1 - snapd - snapd-login-service - ubuntu-core-snapd-units - libdbus-glib-1-2
and now everything works correctly.
I have reinstalled (by Synaptic Package Manager) core-snapd- units
- libsnapd-glib1
- snapd
- snapd-login-service
- ubuntu-
- libdbus-glib-1-2
and now everything works correctly.