1.0.1ubuntu2.12 cause this problem again, after I installed version 1.0.1ubuntu2.13 from http://security.ubuntu.com/ubuntu/pool/main/a/apt/, it all worked again.
When I downgraded again to 1.0.1ubuntu2.12, it still worked... Maybe a configuration problem?
1.0.1ubuntu2.12 cause this problem again, after I installed version 1.0.1ubuntu2.13 from http:// security. ubuntu. com/ubuntu/ pool/main/ a/apt/, it all worked again.
When I downgraded again to 1.0.1ubuntu2.12, it still worked... Maybe a configuration problem?