I can confirm that the package version from bionic-proposed solves the problem.
During an installation I used Dell 2715Q with settings as in the screenshot attached (single monitor mode, 200% scaling). # the updated package apt policy ubiquity ubiquity: Installed: 18.04.14.1 Candidate: 18.04.14.1 Version table: *** 18.04.14.1 500 500 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages 100 /var/lib/dpkg/status 18.04.14 500 500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages Before adding "deb http://archive.ubuntu.com/ubuntu/ bionic-proposed main restricted" to sources.list and doing `apt install ubiquity` I had this in syslog: ay 13 12:39:12 ubuntu ubiquity: W: --force-yes is deprecated, use one of the options starting with --allow instead. May 13 12:39:12 ubuntu ubiquity[4617]: debconffilter_done: ubi-usersetup (current: ubi-usersetup) May 13 12:39:12 ubuntu ubiquity[4617]: Step_before = stepUserInfo May 13 12:39:12 ubuntu kernel: [ 249.861407] do_trap: 40 callbacks suppressed May 13 12:39:12 ubuntu kernel: [ 249.861410] traps: ubiquity[4617] trap int3 ip:7fc1a36cdc41 sp:7ffe6a90a760 error:0 in libglib-2.0.so.0.5600.1[7fc1a367c000+113000] May 13 12:39:21 ubuntu update-notifier[4223]: GtkDialog mapped without a transient parent. This is discouraged. May 13 12:39:22 ubuntu /install.py: Exception during installation: May 13 12:39:22 ubuntu /install.py: Traceback (most recent call last): May 13 12:39:22 ubuntu /install.py: File "/usr/share/ubiquity/install.py", line 765, in <module> May 13 12:39:22 ubuntu /install.py: install.run() May 13 12:39:22 ubuntu /install.py: File "/usr/share/ubiquity/install.py", line 135, in run May 13 12:39:22 ubuntu /install.py: self.copy_all() May 13 12:39:22 ubuntu /install.py: File "/usr/share/ubiquity/install.py", line 513, in copy_all May 13 12:39:22 ubuntu /install.py: self.db.progress('SET', 10 + copy_progress) May 13 12:39:22 ubuntu /install.py: File "/usr/lib/python3/dist-packages/debconf.py", line 83, in <lambda> May 13 12:39:22 ubuntu /install.py: lambda *args, **kw: self.command(command, *args, **kw)) May 13 12:39:22 ubuntu /install.py: File "/usr/lib/python3/dist-packages/debconf.py", line 104, in command May 13 12:39:22 ubuntu /install.py: status = int(status) May 13 12:39:22 ubuntu /install.py: ValueError: invalid literal for int() with base 10: '' After the update a newly started installation went just fine. ** Attachment added: "displays-dell2715q.png" https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1751252/+attachment/5138751/+files/displays-dell2715q.png ** Tags removed: verification-needed-bionic ** Tags added: verification-done-bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1751252 Title: [regression] ubiquity crashed in debconf.py:104 with ValueError: invalid literal for int() with base 10: '' To manage notifications about this bug go to: https://bugs.launchpad.net/cairo/+bug/1751252/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs