I think it is a bug because of the required disc space indicated by update-manager. The first time, it tells me 1100M, the second time 1230M and each times I tried, after I freed some space, it gives me a different number, each time bigger.
In my mind, if update-manager tells me that 1100M of free space is required, if I delete logs and uninstall packages to free the required space, the next time the upgrade should work.
I think it is a bug because of the required disc space indicated by update-manager. The first time, it tells me 1100M, the second time 1230M and each times I tried, after I freed some space, it gives me a different number, each time bigger.
In my mind, if update-manager tells me that 1100M of free space is required, if I delete logs and uninstall packages to free the required space, the next time the upgrade should work.