I was trying to update my ubuntu from 12.10 to 13.04 via command line (update manager wasn't displaying the new release). However, right after I ran
sudo do-release-upgrade, the command line gave me this:
Checking for a new Ubuntu release Traceback (most recent call last): File "/usr/bin/do-release-upgrade", line 145, in <module> fetcher.run_options += ["--mode=%s" % options.mode, AttributeError: type object 'DistUpgradeFetcherCore' has no attribute 'run_options'
How do I fix this? Thanks!