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is it possible to install another version of Ubuntu in my newest version 11.10? Something doesn't work well in this new version; see my post. I may need to switch back. Thanks a lot!

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closed as too localized by Marco Ceppi Oct 26 '11 at 21:41

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Specifically, you want to downgrade, but keep all your settings and files? – Kris Harper Oct 26 '11 at 17:18
Thanks root45. I have fixed the problem. See my post above. It might not be the problem of TeXlive 2009. It might be the problem of pgfmath.sty. – Anand Oct 26 '11 at 18:48
up vote 2 down vote accepted

I don't know about install "in" unless you use a virtual machine. You can install "over" by getting a 11.04 CD and installing like you did 11.10.
You don't happen to have a separate /home partition do you?

Either way it seems like backing up your data and doing a fresh install is what you're looking for.

If you're fortunate enough to have a separate /home partition, when you install select the "manual" or "something else" (no really, that's what it's called in 11.10). Then Highlight the partition you want as root (/), set the mount point to /. Then select the partition you want to use for /home, and set it as /home.
This will let you keep your personal data, while installing the new OS.

If you don't have a separate /home partition do a standard install and consider making one with gparted.

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Oops. Must have missed your comment while I was typing the above. Glad you got it straight. – Argusvision Oct 26 '11 at 18:57
Thanks Argusvision. Your answer is still valuable for us. Fortunately, 11.10 is not that inconvenient.:-) – Anand Oct 27 '11 at 10:30

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