imdea

Building dependency tree
Reading state information... Done
Building data structures... Done

Updating repository information
WARNING: Failed to read mirror file

Third party sources disabled

Some third party entries in your sources.list were disabled. You can
re-enable them after the upgrade with the 'software-properties' tool
or your package manager.

To continue please press [ENTER]

Get:1 http://archive.ubuntu.com natty Release.gpg [198B]
Get:2 http://archive.ubuntu.com natty Release [39.8kB]
Get:3 http://archive.ubuntu.com natty/main Packages [1550kB]
Fetched 1590kB in 6s (208kB/s)

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done

Calculating the changes

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade:
The package 'update-manager-kde' is marked for removal but it is in
the removal blacklist.

This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug against the
'update-manager' package and include the files in
/var/log/dist-upgrade/ in the bug report.


Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done
=== Command detached from window (Thu May 17 23:35:27 2012) ===
=== Command terminated with exit status 1 (Thu May 17 23:35:27 2012) ===