Clem says :
Please skip this paragraph if you already updated your APT sources for Update Pack 3.
Before you apply the updates for Update Pack 4, make sure you’re pointing to the correct repositories.
Edit your APT sources by running the following command in the terminal:
gksu gedit /etc/apt/sources.list
Within this file, replace the following:
Replace security.debian.org with debian.linuxmint.com/latest/security
Replace debian-multimedia.org with debian.linuxmint.com/latest/multimedia
Your APT sources, should now look like this:
deb http://packages.linuxmint.com/ debian main upstream import
deb http://debian.linuxmint.com/latest testing main contrib non-free
deb http://debian.linuxmint.com/latest/security testing/updates main contrib non-free
deb http://debian.linuxmint.com/latest/multimedia testing main non-free
I thought I had updated my sources for UP 3. but they still read 'security.debian' etc.
I assume I must make the list read as amended above.
Only only ask this as I had hadn't seen the blog, applied UP 4 with repositories un-amended, had problems with Cinnamon and had to go back (thanks to Clonezilla|)
Apologies for a very 'Newbie' question!