Команду взял отсюда:
http://compizomania.blogspot.com/2019/02/viber-7001035-snap-...
Теперь у меня 2 вайбера - официальный и не очень. :)user1@debian999:~$ /snap/bin/viber-unofficial.viber
sh: 1: xdg-mime: not found
Qt WebEngine ICU data not found at /snap/viber-unofficial/37/opt/viber/resources. Trying parent directory...
Qt WebEngine resources not found at /snap/viber-unofficial/37/opt/viber/resources. Trying parent directory...
Qt WebEngine ICU data not found at /snap/viber-unofficial/37/opt/viber/resources. Trying parent directory...
Qt WebEngine resources not found at /snap/viber-unofficial/37/opt/viber/resources. Trying parent directory...
QQuickItem: Cannot set activeFocusOnTab to false once item is the active focus item.
QQuickItem: Cannot set activeFocusOnTab to false once item is the active focus item.
ALSA lib conf.c:3750:(snd_config_update_r) Cannot access file /usr/share/alsa/alsa.conf
ALSA lib control.c:954:(snd_ctl_open_noupdate) Invalid CTL
ALSA lib conf.c:3750:(snd_config_update_r) Cannot access file /usr/share/alsa/alsa.conf
ALSA lib control.c:954:(snd_ctl_open_noupdate) Invalid CTL
ALSA lib conf.c:3750:(snd_config_update_r) Cannot access file /usr/share/alsa/alsa.conf
ALSA lib control.c:954:(snd_ctl_open_noupdate) Invalid CTL
ALSA lib conf.c:3750:(snd_config_update_r) Cannot access file /usr/share/alsa/alsa.conf
ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM
ALSA lib conf.c:3750:(snd_config_update_r) Cannot access file /usr/share/alsa/alsa.conf
ALSA lib control.c:954:(snd_ctl_open_noupdate) Invalid CTL
ALSA lib conf.c:3750:(snd_config_update_r) Cannot access file /usr/share/alsa/alsa.conf
ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM
QQuickItem: Cannot set activeFocusOnTab to false once item is the active focus item.
QQuickItem: Cannot set activeFocusOnTab to false once item is the active focus item.
QQuickItem: Cannot set activeFocusOnTab to false once item is the active focus item.
PulseAudioService: pa_context_connect() failed
PulseAudioService: pa_context_connect() failed
Assertion 'pthread_mutex_unlock(&m->mutex) == 0' failed at pulsecore/mutex-posix.c:108, function pa_mutex_unlock(). Aborting.
Aborted
Запустился, спросил номер, выдал QR-code, подумал и закрылся...