I can reproduce the bug, and I also get the same (faulty) result with vanilla vte-0.48 compiled by me (that is, not the Ubuntu package, contrary to comment 7).
Jeremy, could you please test if bringing back 91_keep_fds.patch solves the issue? The error message sounds suspiciously related to what this patch was doing. vte2.91 (0.51.90-1ubuntu1) bionic; urgency=medium [...] * Dropped change, apparently hasn't been needed for years: - Add 91_keep_fds.patch: + Keep file descriptors open on vte_fork_pty() -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1756238 Title: gdebi-gtk broken in 18.04 error: unable to read filedescriptor flags To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdebi/+bug/1756238/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs