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pranav@pranav-Inspiron-5548:~/Downloads$ sudo dpkg -i viber.deb

[sudo] password for pranav: 

Selecting previously unselected package viber.

(Reading database ... 187455 files and directories currently installed.)

Preparing to unpack viber.deb ...

Unpacking viber (7.0.0.1035) ...

dpkg: dependency problems prevent configuration of viber:

 viber depends on libcurl3; however:

  Package libcurl3 is not installed.



dpkg: error processing package viber (--install):

 dependency problems - leaving unconfigured

Processing triggers for bamfdaemon (0.5.3+18.04.20180207.2-0ubuntu1) ...

Rebuilding /usr/share/applications/bamf-2.index...

Processing triggers for desktop-file-utils (0.23-3ubuntu3) ...

Processing triggers for gnome-menus (3.13.3-11ubuntu2) ...

Processing triggers for mime-support (3.60ubuntu1) ...

Processing triggers for hicolor-icon-theme (0.17-2) ...

Errors were encountered while processing:

 viber

I recently made a script for that. Works in Debian and other Debian-based distros (Ubuntu 18.04 tested - working). The script installs libssl1.0.0 (dependency), fakeroot & gdebi for the installation and finally Viber itself.

The problem here is indeed the libcurl package (Viber requires libcurl3 but the OS already uses libcurl4, so there's your conflict).

We'll need to create 2 files (.sh) and make them executable.

touch viber.sh repackager.sh

sudo chmod +x viber.sh repackager.sh

Double click viber.sh and inside it paste this:

sudo apt-get install gdebi fakeroot

wget -O libssl1.0.0 security-cdn.debian.org/debian-security/pool/updates/main/o/openssl/libssl1.0.0_1.0.1t-1+deb8u10_amd64.deb

sudo gdebi libssl1.0.0.deb

wget -O viber.deb http://download.cdn.viber.com/cdn/desktop/Linux/viber.deb

./repackager.sh

sudo gdebi viber4debian.deb

Now, double click repackager.sh (it's important to name it "repackager.sh", otherwise it won't work) and paste this:

#!/bin/sh

fakeroot sh -c "

  mkdir tmp

  dpkg-deb -R viber.deb tmp

  echo 'Package: viber

Priority: extra

Section: non-free/net

Installed-Size: 421336

Maintainer: Viber Media Inc <support@viber.com>

Architecture: amd64

Version: 7.0.0.1035

Replaces: viber (<< 7.0.0.1035)

Depends: libqt5gui5, libxss1, libssl1.0.0, libpulse0, libasound2, libnss3, libxcomposite1, libxcursor1, libxdamage1, libcurl3, libgstreamer-plugins-base1.0-0, libgstreamer1.0-0, gstreamer1.0-plugins-base, gstreamer1.0-plugins-good, gstreamer1.0-plugins-ugly, gstreamer1.0-pulseaudio, gstreamer1.0-libav

Conflicts: viber (<< 7.0.0.1035)

Description: Free Text & Calls.

 Join Viber for Desktop to for a one-of-a-kind calling and messaging experience right on your computer!

 With Viber for Desktop you can make free international calls from your computer to any other Viber user, resting assured your calls and messages are protected by end-to-end encryption.

 Feel free to call, text, send photos and video messages, play YouTube videos and express yourself with stickers and GIFs no matter your location.

 Viber for Desktop also provides you with Viber Out’s low-rate calling plans to any landline or mobile so you can reach out to friends and family who don’t have an internet connection or cell phone.

 Easily sync between your mobile’s chat history and contact list in order to start enjoying Viber for Desktop. .

Homepage: http://viber.com



' > tmp/DEBIAN/control

  dpkg-deb -b tmp viber4debian.deb

"

Let's run the script now (requires root privilages):

sudo ./viber.sh

Enjoy Viber!

Use this commands to fix dependencies:

The viber your trying to install tries to remove libcurl4 and install libcurl3 so your lucky it is even failing. Now install using the following steps:

sudo apt-mark hold libcurl4

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

sudo apt install -f

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

sudo apt-mark unhold libcurl4

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