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Нашел решение для установки viber ubuntu 18.04
https://askubuntu.com/questions/1030479/ubuntu-18-04-unable-to-install-viberThe problem is not only with the viber.deb file but also with the libcurl3 requirement of viber.deb.
In 18.04 libcurl3 cannot coexist with libcurl4 so you are going to face problems with other applications. In my case Viber and Steam could not coexist.
After some search I found the following solution which is to depackage, fix the dependency and then build a new viber file.
The steps are:
Save the viber.deb file in a folder
Open the folder in a terminal
execute the following commands
dpkg-deb -x viber.deb viber
dpkg-deb --control viber.deb viber/DEBIAN
Edit viber/DEBIAN/control and repace "libcurl3" with "libcurl4" (also delete the last blank line from the file or you will get an error afterwards)
dpkg -b viber viberlibcurl4.deb
sudo dpkg -i viberlibcurl4.deb
Or install the .deb file with gdebi
Viber seems to work ok with libcurl4 aleast for me until now.