I have a dual boot Ubuntu (12. something) and Windows 7 system. I upgraded to Ubuntu 14.something - on restart, Ubuntu offered me to upgrade to Ubuntu 16.something which I did as well but something failed during the upgrade.
Now, when I pick Ubuntu in the boot menu, it shows me a prompt where I can enter username, password and then see a shell. Before this I also see a message showing failure installing kernel modules.
In the boot menu, I see a Linux like partition name next to Windows - something of the format -
/dev/dm-0. I do not see the Linux partition from inside Windows explorer.
I need to either reclaim the partition or re-install Ubuntu or any other Linux on it.
I cannot format the Windows partition as I have data on it.