Tested this bug with different supported Ubuntu versions. Texlive, tex-common installed.
Cases:
1. Upgrading Ubuntu 15.10 > 16.04. Can't confirm. 2. Upgrading Ubuntu 14.04.4 > 15.10. Upgrade hangs on VirtualBox and on real hardware. 3. Upgrading Ubuntu 14.04.4 > 16.04. Can't confirm. 4. Upgrading Ubuntu 12.04.4 > 14.04.4. Can't confirm.
Tested this bug with different supported Ubuntu versions. Texlive, tex-common installed.
Cases:
1. Upgrading Ubuntu 15.10 > 16.04. Can't confirm.
2. Upgrading Ubuntu 14.04.4 > 15.10. Upgrade hangs on VirtualBox and on real hardware.
3. Upgrading Ubuntu 14.04.4 > 16.04. Can't confirm.
4. Upgrading Ubuntu 12.04.4 > 14.04.4. Can't confirm.