Yes snap works well with installed packages. But did you try:
snap refresh
With Debian Kernel everything works fine but with siduction kernel I get:
Fehler: cannot perform the following tasks:
- Mount snap "libreoffice" (71) ([start snap-libreoffice-71.mount] failed with exit status 1: Job for snap-libreoffice-71.mount failed.
See "systemctl status snap-libreoffice-71.mount" and "journalctl -xe" for details.
)
- Mount snap "gtk-common-themes" (319) ([start snap-gtk\x2dcommon\x2dthemes-319.mount] failed with exit status 1: Job for snap-gtk\x2dcommon\x2dthemes-319.mount failed.
See "systemctl status "snap-gtk\\x2dcommon\\x2dthemes-319.mount"" and "journalctl -xe" for details.
)
- Mount snap "gtk-common-themes" (319) ([start snap-gtk\x2dcommon\x2dthemes-319.mount] failed with exit status 1: Job for snap-gtk\x2dcommon\x2dthemes-319.mount failed.
See "systemctl status "snap-gtk\\x2dcommon\\x2dthemes-319.mount"" and "journalctl -xe" for details.
)
- Download snap "gtk-common-themes" (319) from channel "stable" (rename /var/lib/snapd/snaps/gtk-common-themes_319.snap.partial /var/lib/snapd/snaps/gtk-common-themes_319.snap: no such file or directory)
For example
systemctl status snap-libreoffice-71.mount
leads to:
● snap-libreoffice-71.mount
Loaded: not-found (Reason: Unit snap-libreoffice-71.mount not found.)
Active: failed (Result: exit-code) since Thu 2018-07-19 16:33:59 CEST; 49min ago
Jul 19 16:33:59 worker-home systemd[1]: Mounting Mount unit for libreoffice, revision 71...
Jul 19 16:33:59 worker-home mount[32047]: mount: /snap/libreoffice/71: mount(2) Systemaufruf ist fehlgeschlagen: Ungültige Adresse.
Jul 19 16:33:59 worker-home systemd[1]: snap-libreoffice-71.mount: Mount process exited, code=exited status=32
Jul 19 16:33:59 worker-home systemd[1]: snap-libreoffice-71.mount: Failed with result 'exit-code'.
Jul 19 16:33:59 worker-home systemd[1]: Failed to mount Mount unit for libreoffice, revision 71.