For most users the DNS servers provided by their ISP may suffice, but some user may need DNS that are faster, safer and with far fewer restrictions for online browsing.
To change the DNS servers in Ubuntu, you need to modify the file ‘dhclient.conf’.
Ubuntu
Shutdown or restart Ubuntu from Dash
If you want to be able to end the current session of Ubuntu or even shut down / restart your PC rapidly from Dash instead of having to click around various menu, you have to install “power-commands”.
Fixing "PPA name or format is correct" on Ubuntu
We have seen how to add an additional repository on Ubuntu and it is a very simple process, but in some rare case we may get an error message that says:
Cannot add PPA: ‘ppa:<ppa_name>’. Please check that the PPA name or format is correct.