I have fresh install of LMDE xfce 201109. I saw that changing APT was important via that blog url above. It said "first thing you need to do":
gksu gedit /etc/apt/sources.list
.... Note: Coming out of Mint 8 KDE I was unsure of using terminal to do replacements, and not even realizing this invoked a text editor (since I did not know what gedit was)... So, I used Software Manager, and Software sources, editing the values therein. It reads like this:
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http://debian.linuxmint.com/latest testing main contrib non-free
http://debian.linuxmint.com/latest/security testing/updates main contrib non-free
http://debian.linuxmint.com/latest/multimedia testing main non-free
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W: Failed to fetch http://www.debian.linuxmint.com/latest/multimedia/dists/testing/InRelease
W: Failed to fetch http://www.debian.linuxmint.com/latest/multimedia/dists/testing/Release.gpg Could not resolve 'www.debian.linuxmint.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
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(gedit:27095): EggSMClient-WARNING **: Failed to connect to the session manager: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed]
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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://www.debian.linuxmint.com/latest/multimedia testing main non-free
deb http://packages.linuxmint.com/ debian main
deb-src http://packages.linuxmint.com/ debian main
Also, after making the APT source changes, but before I tried to refresh the Update Manage (related above), I tried to run the update and got some error that apparently stopped everything:
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]E: /var/cache/apt/archives/gstreamer0.10-plugins-bad_0.10.22-3_i386.deb: trying to overwrite '/usr/lib/gstreamer-0.10/libgstxvid.so', which is also in package gstreamer0.10-plugins-really-bad 0.10.22-0.1