Comment 9 for bug 1607874

Hi, I upgraded a Ubuntu 14.04 to 16.04 and got many failed packages configurations during the upgrade. It's likely due to this.

After the upgrade, *before rebooting*, I did

dpkg --configure --pending

remaining errors were on linux-* packages and initramsfs-tools, still not rebooted.

I removed old packages from kernel 3.13 that where still here and caused failures on microcode

dpkg --configure -a
issue with casper-memdisk

Removed it: https://askubuntu.com/questions/624519/upgrade-from-14-04-to-15-04-fails/635679#635679
sudo dpkg -P casper-memdisk

dpkg --configure -a
success

reboot, doesn't boot

grub => failsafe
in menu select => continue normal boot (actually that's not a normal boot, I guess things like nomodeset have been added)
boot success

To be continued: to be able to normally boot. But I hope that these details can help someone else. (disclaimer: I might have done something stupid ^^")