When I try to update my Ubuntu 10.04 installation to 10.10 I get the following error.

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade:
Trying to install blacklisted version 'blcr-dkms_0.8.2-13'

 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.

None of the three applies to me (I think).

Now I found that this also affects someone else: https://bugs.launchpad.net/update-manager/+bug/657662

Is there here someone who knows what could be wrong? Or a workaround so that I can install Maverick Meerkat?


Based on the good suggestion by PocketSam

Look with aptitude why blcr-dkms why the package is installed, and remove that package if possible. For me, this was the package r-cran-rmpi which I actually don't use but installed with a apt-get install r-cran-* command.

Don't forget to do a apt-get autoremove to really uninstall the blcr-dkms package automatically.

The reason for this package not working is explained here


Maybe you may try to remove this module using dkms?

sudo dkms uninstall blcr-dkms 
sudo dkms remove -all blcr-dkms

Have no idea if it will break something. BLCR (Berkeley Lab Checkpoint/Restart) allows programs running on Linux to be "checkpointed" (written entirely to a file), and then later "restarted".


I got the same message but when I tried for the third time using sudo update-manager -d It worked...

  • Third time it worked for me too!! – pramod Oct 10 '10 at 21:09
  • As @Toby Lunn, @Bert, @pramod, it worked for me after having tried a few times. – Agmenor Nov 20 '10 at 18:40

I was getting this bug, but it seems to be solved after I did a

sudo apt-get install blcr-dkms

Use Synaptic and simply uninstall the blcr-dkms package.

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