Fiz upgrade do 12.04 para o 12.10.
Tudo funciona bem, mas o "canais de software" não abre no synaptic, nem na Central de Programas do Ubuntu.
Abrindo o synaptic, como sudo, no terminal, e depois clicando no próprio synaptic em canais de software:
ricardo@ricardo:~$ sudo synaptic
[sudo] password for ricardo:
Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated.
Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated.
gpg: /tmp/tmpq3ic1f/trustdb.gpg: banco de dados de confiabilidade criado
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/UbuntuDrivers/detect.py", line 162, in packages_for_modalias
cache_map = packages_for_modalias.cache_maps[apt_cache_hash]
KeyError: -1063526608
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/bin/software-properties-gtk", line 103, in <module>
app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file)
File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 178, in __init__
self.init_drivers()
File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 1097, in init_drivers
self.devices = detect.system_device_drivers()
File "/usr/lib/python3/dist-packages/UbuntuDrivers/detect.py", line 415, in system_device_drivers
for pkg, pkginfo in system_driver_packages(apt_cache).items():
File "/usr/lib/python3/dist-packages/UbuntuDrivers/detect.py", line 319, in system_driver_packages
for p in packages_for_modalias(apt_cache, alias):
File "/usr/lib/python3/dist-packages/UbuntuDrivers/detect.py", line 164, in packages_for_modalias
cache_map = _apt_cache_modalias_map(apt_cache)
File "/usr/lib/python3/dist-packages/UbuntuDrivers/detect.py", line 129, in _apt_cache_modalias_map
m = package.candidate.record['Modaliases']
File "/usr/lib/python3/dist-packages/apt/package.py", line 429, in record
return Record(self._records.record)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe3 in position 349: invalid continuation byte
ricardo@ricardo:~$
Estou faz três dias pesquisando. Não encontrei solução.