ubiquity crashed in debconf.py:104 with ValueError: invalid literal for int() with base 10: ''

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding ubiquity. This problem was most recently seen with package version 18.04.14, the problem page at https://errors.ubuntu.com/problem/82f7f7e7923663c7b2123c7f1f49af29f6ff4d77 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

[Daniel van Vugt (vanvugt)]

Confirmed. Not just by the 887 people who report this crash on errors.ubuntu.com, but also on one particular machine I have where the installer keeps crashing:

Apr 29 22:54:52 ubuntu ubiquity[3581]: debconffilter_done: ubi-usersetup (current: ubi-usersetup)
Apr 29 22:54:52 ubuntu ubiquity[3581]: Step_before = stepUserInfo
Apr 29 22:54:52 ubuntu kernel: do_trap: 28 callbacks suppressed
Apr 29 22:54:52 ubuntu kernel: traps: ubiquity[3581] trap int3 ip:7fd2ca14ec41 sp:7fffd3ffdfa0 error:0 in libglib-2.0.so.0.5600.1[7fd2ca0fd000+113000]
Apr 29 22:55:04 ubuntu /install.py[8718]: Exception during installation:
Apr 29 22:55:04 ubuntu /install.py[8718]: Traceback (most recent call last):
Apr 29 22:55:04 ubuntu /install.py[8718]: File "/usr/share/ubiquity/install.py", line 765, in <module>
Apr 29 22:55:04 ubuntu /install.py[8718]: install.run()
Apr 29 22:55:04 ubuntu /install.py[8718]: File "/usr/share/ubiquity/install.py", line 135, in run
Apr 29 22:55:04 ubuntu /install.py[8718]: self.copy_all()
Apr 29 22:55:04 ubuntu /install.py[8718]: File "/usr/share/ubiquity/install.py", line 513, in copy_all
Apr 29 22:55:04 ubuntu /install.py[8718]: self.db.progress('SET', 10 + copy_progress)
Apr 29 22:55:04 ubuntu /install.py[8718]: File "/usr/lib/python3/dist-packages/debconf.py", line 83, in <lambda>
Apr 29 22:55:04 ubuntu /install.py[8718]: lambda *args, **kw: self.command(command, *args, **kw))
Apr 29 22:55:04 ubuntu /install.py[8718]: File "/usr/lib/python3/dist-packages/debconf.py", line 104, in command
Apr 29 22:55:04 ubuntu /install.py[8718]: status = int(status)
Apr 29 22:55:04 ubuntu /install.py[8718]: ValueError: invalid literal for int() with base 10: ''
Apr 29 22:55:04 ubuntu /install.py[8718]:

[Daniel van Vugt (vanvugt)]

Also tracking in:
https://errors.ubuntu.com/problem/82f7f7e7923663c7b2123c7f1f49af29f6ff4d77
https://errors.ubuntu.com/problem/735a2b847e0eeab6c8a7b954de5110e43889be15

[Seyed Mustafa Afzouni (afzouni)]

For Installing ubuntu 18.04 on MacBook Pro 2015, I have this problem.

[Seyed Mustafa Afzouni (afzouni)]

In the Live Version on MacBook Pro 2015 (13 inches, Retina) I changed the 'Screen Scale' from 200% to 100%, settings > Device > Display, and solved

[Lars Kanis (sq2d3-lars)]

I had the same issue on a Dell XPS-13 with 4k display and changing 'Screen Scale' to 100% for the installation did the trick.