Ubuntu 18.04 Unable to install Viber

UPDATE: The same issue arises when you try to install the newest viber 12.0.0.7 in ubuntu 20.04 (at least the beta until now), but with the problematic dependency being libssl1.0. Ubuntu has libssl1.1 installed.

The solution is the exactly the same, just use the corresponding names.

The problem is not only with the viber.deb file but also with the libcurl3 requirement of viber.deb.

In Ubuntu 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 deb-package, fix the dependency and then build a new viber file.

The steps are:

1. Save the viber.deb file in a folder
2. Open the folder in a terminal
3. execute the following commands
4. dpkg-deb -x viber.deb viber
5. dpkg-deb --control viber.deb viber/DEBIAN
6. Edit viber/DEBIAN/control and replace "libcurl3" with "libcurl4" (also delete the last blank line from the file or you will get an error afterwards)
7. dpkg -b viber viberlibcurl4.deb
8. sudo dpkg -i viberlibcurl4.deb or install the .deb file with gdebi

Viber seems to work ok with libcurl4 atleast for me until now.

I found the solution here, in a comment...

https://linuxconfig.org/how-to-install-viber-on-ubuntu-18-04-bionic-beaver-linux

sudo dpkg -i --ignore-depends=libcurl3 viber.deb

Works perfectly for me.

Update: @borowis is right: after installing this way it gets uninstalled on fix broken dependencies. Another one line, but still workable solution is:

sudo apt install libcurl3 ~/viber.deb 

source: https://linuxconfig.org/how-to-install-viber-on-ubuntu-18-04-bionic-beaver-linux

The easiest way is to convert the rpm package on Viber website to a deb package. To do that:

Download the rpm package with:

wget https://download.cdn.viber.com/desktop/Linux/viber.rpm

Install alien, convert the rpm package and install the newly created deb package:

sudo apt-get install alien
sudo alien --to-deb --scripts viber.rpm
sudo dpkg -i viber_7.0.0.1035-3_amd64.deb

The conversion will take about 5 minutes. Be patient!

If you don't mind to use snap, you can install Viber easily from Snap Store:

sudo snap install viber-unofficial

Disclaimer: I've added this snap to snap store.

The solution to installing Viber on Ubuntu 18.04 is to explicitly include the libcurl3 package prerequisite as part of the apt installation command:

sudo apt install libcurl3 ~/Downloads/viber.deb

How to install Viber on Ubuntu 18.04 Bionic Beaver Linux

You can also just install the flatpak version from flathub.org

After trying some above answers I found another solution. There is a cURL PPA which supports both cURL version 3 and 4.

https://launchpad.net/~xapienz/+archive/ubuntu/curl34

So, I added this PPA to my Ubuntu 18.04 and installed cURL from there. Then I installed Viber with this below command-

sudo dpkg -i viber.deb

And Viber is working fine till then.

No broken package warning till now and libcurl4 package is installed.

The better way to install single deb-packages it to use APT-tool, which will solve all dependencies automatically:

sudo apt-get install ./Downloads/viber.deb 

You can install libcurl3 and remove libcurl4.

All the programs as far as I know, like Opera and Brackets work fine with either.

Go to terminal and type:

sudo apt install libcurl3

When asked for confirmation press y

This will automatically remove all libcurl4 and it's dependencies and install libcurl3.

As a precaution do:

sudo apt install -f

to fix any dependency issues that may occur.

Now download the viber debian package from their official site.

In terminal type

sudo dpkg -i viber.deb
sudo install -f

This should install viber without any trouble.

Now open viber from launchpad.

Happy chatting in viber :)

Viber released version 10.30, so this problem is solved. I recommend the installation of the latest version.