Last night I attempted to upgrade from 15.04 to 15.10. Everything went fine until the installer got to the Installing the upgrades step, where it hangs (stops progress) at Installed libxfce4ui-1-0 (i386). The terminal pops up, the last line of which is Found memtest86+ image: /boot/memtest86+.bin. I also have ~50% iowait on my processor, so I let it sit overnight to see if it could figure out what it needs to do. No change. I also don't see anything obvious going on background-wise.
Here's something from /var/log/dist-upgrade/main.log: 2015-10-23 08:23:50,551 WARNING no activity on terminal for 300 seconds (Installed libxfce4ui-1-0 (i386))
Here's everything from /var/log/dist-upgrade/apt-term.log:
Found initrd image: /boot/initrd.img-3.19.0-26-generic
Found linux image: /boot/vmlinuz-3.19.0-25-generic
Found initrd image: /boot/initrd.img-3.19.0-25-generic
Found linux image: /boot/vmlinuz-3.19.0-15-generic
Found initrd image: /boot/initrd.img-3.19.0-15-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
Those are all the clues I know how to gather at this point. Any help will be appreciated.
The strange thing is that I didn't even know I had XFCE installed since I always use Unity. Is there a way to tell the installer to skip this step without aborting the installation and as a consequence completely breaking my installation? Thank you in advance.
Update
According to Upgrade hangs on ttf-mscorefonts-installer, the command ps -ejHf can be used to gather some more clues as to what might be wrong. For instance, ps -ejHf | grep wily returns:
root 5417 4359 2602 2602 0 Oct22 ? 00:04:22 /usr/bin/python3 /tmp/ubuntu-release-upgrader-e76uh732/wily --mode=server --frontend=DistUpgradeViewGtk3
root 26681 5417 26681 26681 1 Oct22 pts/1 00:11:28 /usr/bin/python3 /tmp/ubuntu-release-upgrader-e76uh732/wily --mode=server --frontend=DistUpgradeViewGtk3
That's not terribly useful, but at least it's something.