Comment 27 for bug 152296

PartisanEntity and others arriving here because your Update Manager is hanging, you probably do _not_ have the same problem as the one for which this bug was opened. This bug is related to a hang of the Update Manager when it is "asking for confirmation" and apparently unable to pop up a confirmation box with the proposed updates/deletes.

If your update manager is hanging while "reading cache" or checking package manager your problem is probably related to the performance of the distribution servers and is discussed under the bug given by PartisanEntity: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/153984