Here is an alternate patch, using _error->Notice instead of _error->Warning. Using Notice leaves _error->empty false and hence the apt-get update warning is not printed. For comparison. here the output of the two patches:
apt-unreadable_sources.patch: $ apt-cache policy apache2 apache2: Installed: (none) Candidate: 2.2.22-1ubuntu1 Version table: 2.2.22-1ubuntu1 0 500 http://archive.ubuntu.com/ubuntu/ precise/main i386 Packages 2.2.14-5ubuntu8 0 500 http://archive.ubuntu.com/ubuntu/ lucid/main i386 Packages W: Can not read /etc/apt/sources.list.d/a.list, ignore the apt-get update warning below W: You may want to run apt-get update to correct these problems apt-unreadable_sources_notice.patch: $ apt-cache policy apache2 apache2: Installed: (none) Candidate: 2.2.22-1ubuntu1 Version table: 2.2.22-1ubuntu1 0 500 http://archive.ubuntu.com/ubuntu/ precise/main i386 Packages 2.2.14-5ubuntu8 0 500 http://archive.ubuntu.com/ubuntu/ lucid/main i386 Packages N: Can not read /etc/apt/sources.list.d/a.list. ** Patch added: "apt-unreadable_sources_notice.patch" https://bugs.launchpad.net/ubuntu/+source/apt/+bug/849736/+attachment/2796485/+files/apt-unreadable_sources_notice.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/849736 Title: apt-cache policy silently shows inaccurate information when any file in /etc/apt/sources.list.d is unreadable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/849736/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs