How to handle out of space errors

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http://askubuntu.com – I'm using Ubuntu installed inside windows with Wubi. During upgrade to 12.04 I came across a rather devious trap. About 25% through the installation of packages, I get the message that packages can't be installed due to lack of disk space on /usr. And of course, its down to 140M when I check. So what to do? Can't interrupt, can't continue. Since I have a huge disk that seems accessible, which is /host, namely the USB HDD I have Ubuntu installed on, I figure what the heck, perhaps I can copy over some files there and then make links to them in /usr. So I tried sudo mv /usr/lib /host/usr, but (HowTos)