Installing the package from https://launchpad.net/ubuntu/lucid/amd64/linux-headers-2.6.35-30/2.6.35-30.55~lucid1 is a workaround (at least it gets Update Manager to stop complaining)
Installing the package from https:/ /launchpad. net/ubuntu/ lucid/amd64/ linux-headers- 2.6.35- 30/2.6. 35-30.55~ lucid1 is a workaround (at least it gets Update Manager to stop complaining)