Nowadays robomongo developers releasing the new versions of robomongo as tar.gz not in .deb packages that was easy for double click installations. But
Robomongo is now Robo 3T. Following are the updated steps:
Download the tar file from robomongo site. The current file is robo3t-1.1.1-linux-x86_64-c93c6b0.tar.gz, but yours could be different.
Open up the terminal, switch to download directory and run the following commands:
$ tar -xvzf robo3t-1.1.1-linux-x86_64-c93c6b0.tar.gz
$ sudo mkdir /usr/local/bin/robomongo
$ sudo mv robo3t-1.1.1-linux-x86_64-c93c6b0/* /usr/local/bin/robomongo
$ cd /usr/local/bin/robomongo/bin
$ sudo chmod +x robo3t
$ sudo gedit ~/.bashrc
Add the following line to the end of .bashrc file:
alias robomongo='/usr/local/bin/robomongo/bin/robo3t'
Save and close the file. Now reload it using the following command:
$ source ~/.bashrc
Then you can run robomongo from your terminal and it will work:
$ robomongo