Skype was working perfectly on my Ubuntu 14.04 LTS until some time early November 2017. When I launch skype from the terminal, the login box pops up, I enter my credentials and then skype just closes. The terminal has a lot of output, ending in
Gtk-Message: Failed to load module "canberra-gtk-module"
Can I reinstall Skype?
It appears Skype has been upgraded (see here). First remove your old skype
$ sudo apt-get --purge remove skype:i386
$ rm -r ~/.Skype/
Then go here https://www.skype.com/en/get-skype/ and choose 'Get Skype for Linux DEB'.
Once the .deb file has been downloaded, right-click on the .deb file, and open with Ubuntu Software Centre. If this isn't listed, click on 'Open with Other Application' > 'Show Other Applications' > 'Ubuntu Software Centre'. Once loaded into Ubuntu Software Centre, click the 'install' button.
Once the installation is complete, either launch from the terminal with
$ skypeforlinux
or click on the top left icon on the launcher on the Ubuntu desktop. Type in 'skype', and click on the Skype icon under 'Applications'. This will launch your newly installed skype.