Upgrading from Ubuntu 10.10 to Ubuntu 11.04 issue

[Emilia]

Hi everyone, i recently upgraded my Ubuntu 10.04 to Ubuntu 10.10 in order
to upgrade it later to Ubuntu 11.04 and then to the very last version.
The problem is that now I can't continue upgrading it and i'm kind of
stucked in Ubuntu 10.10 ...

The error it throws when i try to upgrade says something like this (sorry
if my English is not that good):


Not valid information about packages

After upgrading packages's information, it no longer appears the essential
package «ubuntu-minimal».
This is a serious error; please inform about the failure of
package «update-manager» and attach the files in  /var/log/dist-upgrade/.


So, in  /var/log/dist-upgrade/ i've got this:

"
============================================================================
" Netrw Directory Listing                                        (netrw
v136)
"   /var/log/dist-upgrade
"   Sorted by      name
"   Sort sequence:
[\/]$,\<core\%(\.\d\+\)\=\>,\.h$,\.c$,\.cpp$,*,\.o$,\.obj$,\.info$,\.swp$,\.bak$,\~$
"   Quick Help: <F1>:help  -:go up dir  D:delete  R:rename  s:sort-by
 x:exec
"
============================================================================
../
20090417-1735/
20090417-1738/
20090417-1741/
20090417-1742/
20091027-1817/
20091027-1823/
20091027-1826/
20091027-1829/
20091102-1703/
20100514-1513/
20100514-1515/
20100514-1518/
20121025-2013/
20121027-1933/
20121027-2141/
20121027-2148/
20121028-0036/
apt-clone_system_state.tar.gz
apt.log
lspci.txt
main.log
main.log.partial
system_state.tar.gz
term.log


What can i do? Any ideas?
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