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I am trying to downgrade from Squeeze back to Lenny with the usual method by adding to my /etc/apt/preferences:

Package: *
Pin: release a=oldstable
Pin-Priority: 1001

and then doing sudo apt-get update && sudo apt-get upgrade but for some reason it does not work (I got both stable and oldstable in sources.list)

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“Does not work” is a useless description. You have the preferences right, but downgrades aren't officially supported, and typically need to be babysitted. – Gilles Mar 31 '11 at 23:21
Right, I wouldn't post if it worked. Any details concerning "babysitting" downgrades? Would greatly appreciate. – helcim May 13 '11 at 7:18
Not upgrade, but dist-upgrade... – peterh Nov 8 '14 at 20:30
up vote 3 down vote accepted

The last article I read suggested you need a fresh Lenny install I'm afraid.

Hopefully it's only 20 mins or so. I'd opt for that after a quick backup.

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That's what I was afraid of. Thanks for confirmation. – helcim Mar 27 '11 at 19:35
No problem at all. – Jonathan Ross Mar 27 '11 at 19:43
It seems it's necessary to download the full CD or DVD and you can't find the mirror easily on Debian website. However the page is still there so I give the address for those unlucky few who have to downgrade – helcim May 13 '11 at 7:27

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