The software center of Linux Mint 20.1 Cinnamon Edge offers Viber as a flatpak package. Installation is a breeze and the only downside is that it takes a lot more space than the .deb version from the official Viber homepage. I'm not sure if it is a common problem, but for me, the indicator icon was missing from the cinnamon taskbar.
Just had this happen to me. I didn't really watch what I was doing and issued the "sudo apt-get dist-upgrade" command which for some weird reason removed Kodi from my system. After reinstalling it with "sudo apt-get install kodi" all I got was a black screen instead of the Kodi user interface.
Last weekend I tried to get some work done while staying in the countryside. I hooked up my laptop to the net using my Android phone as a mobile hotspot and did my thing just like in the office. However, during the breaks when I tried to browse Reddit or do anything net related on my phone, there was seemingly no internet available.