[ubuntu-uk] installing virtualbox,couldnt, now errors!

[STONE COLD]

hi.

i need help...i was trying to install virtualbox but didnt know what i was doing :(

..in the end i couldnt install it. Now when i open synaptic..i get this

" An unresolvable problem occurred while initialising the package information.

Please report this bug against the 'update-manager' package and include the following error message:

'E:The package virtualbox needs to be reinstalled, but I can't find an archive for it.'"

What to do?

Regards
Javad
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