Ubuntu – How to install the latest gmp library in 12.04

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.

Ubuntu comes with an office suit by default, called Libre Office. If you would still like to install Open Office follow these directions.

Download..

Download Open Office from Openoffice.org (or use this direct link).
Save the file to your Downloads folder.

Install..

I highly recommend that you remove ALL previously installed versions of Open Office before proceeding!

Open a terminal and cd to the downloads folder:

cd Downloads  

Now we need to untar the installation folder:

tar -xvzf Apache_OpenOffice_incubating_3.4.1_Linux_x86-64_install-deb_en-GB.tar.gz

Then cd to the folder we just extracted:

cd en-GB/DEBS  

And install all the packages:

sudo dpkg -i *.deb  

When that has finished cd to the "Desktop Integration" folder:

cd desktop-integration  

and install those packages:

sudo dpkg -i *.deb  

And you're done!

You can now remove the en-GB folder.