upgrade to 7.04 problem

[Jarl]

when i am trying to upgrade, a message that tell me that the upgrade is
cancelled, there must be at least314M space on /usr.
the message suggest to emty the recyclebin, and run:  sudo apt-get
clean,   and then the upgrade shuts down.

I have done  sudo apt-get clean, and emtyed recycle bin, nothing changes.
there is plenty space on the hard drive, and my ubuntu installation is
standard, no tampering done.

my current version is 6.10, running on a hp notebook.

Any suggestions?

rgds
jarl
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