Hi, I was unable to reproduce in a lxd container of 16.04:
root@xenial:~# sudo apt install python3-six Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: python3-six 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 11.0 kB of archives. After this operation, 54.3 kB of additional disk space will be used. Get:1 http://archive.ubuntu.com/ubuntu xenial/main amd64 python3-six all 1.10.0-3 [11.0 kB] Fetched 11.0 kB in 0s (37.5 kB/s) Selecting previously unselected package python3-six. (Reading database ... 13842 files and directories currently installed.) Preparing to unpack .../python3-six_1.10.0-3_all.deb ... Unpacking python3-six (1.10.0-3) ... Setting up python3-six (1.10.0-3) ... root@xenial:~# If you have steps to reproduce that be very helpful, as out of the box this appears to work. I would also suggest updating your other packages to make sure things are not conflicting. ** Changed in: six (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1578588 Title: package python3-six 1.10.0-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/six/+bug/1578588/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs