Comment 2 for bug 1241148

I get the following (below). It is strange because I allready upgraded 3 machines with same locale (NL).

ferry@eeepc:~$ do-release-upgrade -m desktop -f DistUpgradeViewKDE -d
Er wordt gecontroleerd of er een nieuwe Ubuntu-uitgave is
Get:1 Handtekening opwaardeerprogramma [198 B]
Get:2 Opwaardeerprogramma [1140 kB]
Fetched 1140 kB in 6s (147 kB/s)
Traceback (most recent call last):
  File "/usr/bin/do-release-upgrade", line 152, in <module>
    fetcher.run()
  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcherCore.py", line 281, in run
    if not self.authenticate():
  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcherCore.py", line 77, in authenticate
    'signature': os.path.basename(sig)})
UnicodeEncodeError: 'ascii' codec can't encode character '\xeb' in position 47: ordinal not in range(128)