Hi Mathias, so with 188.8.131.524-2ubuntu1.7 before this did not happen? I can confirm the issue in a trusty container.
If I go back to the released version: $ apt-get install ruby1.9.1=184.108.40.2064-2ubuntu1 libruby1.9.1=220.127.116.114-2ubuntu1 things are ok again. Although it is "only" a warning. My gems are still listed. Old: # gem list *** LOCAL GEMS *** hello (0.0.1) New: # gem list YAML safe loading is not available. Please upgrade psych to a version that supports safe loading (>= 2.0). *** LOCAL GEMS *** hello (0.0.1) ruby-psych is only available in much later releases. This might be an issue of the latest security fixes. Especially this might be related: 3 * SECURITY UPDATE: Deserialization untrusted data 4 - debian/patches/CVE-2018-1000074*.patch fix in 5 lib/rubygems/commands/owner_command.rb, 6 test/rubygems/test_gem_commands_owner_command.rb. 7 - CVE-2018-1000074 I'm marking as an upgrade-regression and subscribe Leo who did the fix. ** CVE added: https://cve.mitre.org/cgi- bin/cvename.cgi?name=2018-1000074 ** Tags added: regression-update -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763414 Title: ruby 18.104.22.1684-2ubuntu1.8 throws gem warning To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ruby1.9.1/+bug/1763414/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs