I've noticed that Viber on my Ubuntu PC stopped syncing messages with Viber app on my mobile phone. I didn't find solution on Viber Help pages so I had to find the fix myself. It's actually very simple: you just have to delete one file and restart the application, no Viber reinstall is needed!
Before everything, exit Viber application on PC.
Let's find all Viber files and directories:
$ sudo find / -name "*viber*"
/var/lib/dpkg/info/viber.md5sums
/var/lib/dpkg/info/viber.list
/var/lib/dpkg/info/viber.postinst
/var/lib/dpkg/info/viber.prerm
/var/lib/dpkg/info/viber.preinst
/var/lib/dpkg/info/viber.0
/var/lib/dpkg/info/viber.copyright
/home/bojan/Downloads/viber.deb
/home/bojan/.cache/gnome-software/icons/4759200235b7bb401072b357b6bcd10db4e6c4a1-viber-icon-logo-4E5ED1327A-seeklogo.com.png
/home/bojan/.ViberPC/440123456789/viber.db-shm
/home/bojan/.ViberPC/440123456789/viber.db-wal
/home/bojan/.ViberPC/440123456789/viber.db
/usr/share/applications/viber.desktop
/usr/share/pixmaps/viber.png
/usr/share/viber
/opt/viber
NOTE: 440123456789 is the number of the mobile device to which you've been syncing messages so far.
/home/bojan/.ViberPC/440123456789/viber.db is file which contains all message history. Let's delete it:
$ rm ~/.ViberPC/440123456789/viber.db
Open Viber app on mobile phone and re-launch Viber on PC (from Applications or from Terminal, like here):
$ /opt/viber/Viber
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
qml: *** popupMode = 1920
qrc:/QML/DebugMenu.qml:262: TypeError: Cannot call method 'isWasabiEnabled' of undefined
qrc:/QML/DebugMenu.qml:289: TypeError: Cannot call method 'isSearchInCommunitiesForceEnabled' of undefined
qrc:/QML/DebugMenu.qml:296: TypeError: Cannot call method 'isOOABURISpamCheckerForceEnabled' of undefined
qrc:/QML/DebugMenu.qml:304: TypeError: Cannot call method 'isRateCallQualityForceEnabled' of undefined
We'll see prompts telling us to approve syncing on both PC and mobile applications:
 |
| Viber sync approval prompt on PC |
 |
| Viber sync approval prompt on mobile phone |
 |
| Viber sync start prompt on PC |
After we approve syncing on both devices, syncing process will start:
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| Viber syncing message on mobile phone |
 |
| Viber syncing message on PC |
|
After the process completes your Viber on PC will be synced with mobile phone Viber app.
If removing viber.db does not help, delete also data.db:
$ rm ~/.ViberPC/440123456789/data.db
...and repeat the whole process.
