The update-manager crashes with the following error frank@darkstar2:~$ update-manager Traceback (most recent call last): File "/usr/bin/update-manager", line 33, in <module> from UpdateManager.UpdateManager import UpdateManager File "/usr/lib/python2.7/dist-packages/UpdateManager/UpdateManager.py", line 72, in <module> from Core.MyCache import MyCache File "/usr/lib/python2.7/dist-packages/UpdateManager/Core/MyCache.py", line 34, in <module> import DistUpgrade.DistUpgradeCache File "/usr/lib/python2.7/dist-packages/DistUpgrade/DistUpgradeCache.py", line 60, in <module> KERNEL_INITRD_SIZE = _set_kernel_initrd_size() File "/usr/lib/python2.7/dist-packages/DistUpgrade/DistUpgradeCache.py", line 53, in _set_kernel_initrd_size size = estimate_kernel_size_in_boot() File "/usr/lib/python2.7/dist-packages/DistUpgrade/utils.py", line 74, in estimate_kernel_size_in_boot size += os.path.getsize(f) File "/usr/lib/python2.7/genericpath.py", line 49, in getsize return os.stat(filename).st_size OSError: [Errno 5] Input/output error: '/boot/abi-3.2.0-54-generic' I am not sure how to read the error but it seems there is some error in file size. How do I fix it.