You may be right. I went back through the logs and confirmed that the checksums of the same item were identical on the succesful join and different on the failed join.
Succesful (Ubuntu 11.10) server: Message: pakset_info_t::debug: PostOffice -> sha1 = B80C3C262A2758C8FC54FF129272F564B7DA8AAF Succesful (Ubuntu 11.10) client: Message: pakset_info_t::debug: PostOffice -> sha1 = B80C3C262A2758C8FC54FF129272F564B7DA8AAF Failed (Manually-installed) server: Message: pakset_info_t::debug: PostOffice -> sha1 = 263C0CB8C858272A12FF54FC64F57292AF8ADAB7 Failed (Ubuntu 11.10) client: Message: pakset_info_t::debug: PostOffice -> sha1 = B80C3C262A2758C8FC54FF129272F564B7DA8AAF Interesting double-check: $ openssl sha1 ${manual-pak}/building.PostOffice.pak SHA1(/home/me/simutrans110/simutrans/pak/building.PostOffice.pak)= 8b1b5caa71013474039f357094cd1716bd3800bd $ openssl sha1 ${deb-pak}/building.PostOffice.pak SHA1(/usr/share/games/simutrans/pak/building.PostOffice.pak)= 8b1b5caa71013474039f357094cd1716bd3800bd So the those pakset items (and, by extension, likely the entire pakset) are identical. And they are indeed checksummed differently in the Debian-package install. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/931181 Title: Multiplayer network games are unreachable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/simutrans/+bug/931181/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs