Ubuntu – Installing GSL libraries in Ubuntu 16.04 via terminal

Follow the step-by-step approach described in the link. You should be able to do it. https://help.ubuntu.com/community/Repositories/Ubuntu

Regarding the mounting related query

When you mount a disc normally with the file browser (nautilus etc) it mounts disks by interacting with udisks behind the scenes. You can do the same thing on the command line with the udisks tool. eg /usr/bin/udisks --mount /dev/sdb1 The bit after --mount is the device name of the partition you want to mount. (/dev/something)

Alternately try mounting the CD using the mount command.You can check the MAN page for "mount" if you are new to mount command.

In the terminal I chose directory and did: "sudo apt-get intall *.deb"

Here there are two problems:

1. intall is misspelled, it should be install
2. apt-get do not install local packages. It only installs packages that comes from the repositories.

So, you are using a screwdriver when you need a hammer, and that hammer is called dpkg. With dpkg you can install packages manually only using:

sudo dpkg -i *.deb

Of course, this could leave some dependencies with problems. For that I use GDebi instead:

sudo apt-get install gdebi-core
sudo gdebi *.deb

This will install the packages and any dependency needed.