graphics - ubuntu 16.04 LTS Login Loop & Black screen TTY - Ask Ubuntu

first of all, don't judge me instantly, might seem duplicated question honestly, can't find solution case. that's why came here.

okey here's deal. started morning starting computer , log in ubuntu. worked charm! then, time time, system updater popped , there couple updates. checked them, , looked great , clicked "install" or "update" - reason not sure button says, anyway... then, meanwhile finishing coffee, updates finished , decided start workday. @ moment i'm working on big video project opened kdenlive. unexpectedly doesn't opened @ all, , kdenlive wasn't 1 whom behavior weird. still bit sleepy haven't enough energy start figuring out what's going on decided restart computer , crossed fingers magic reboot. well.. wasn't.

login loop decided stopped by. first reaction was, oh sh*t system broken? did lost everything?

i guess didn't. assuming fix if i'd able open tty. ctrl + alt + f1 give me black screen. followd answer: graphics issues after/while installing ubuntu 16.04/16.10 nvidia graphics

and edit grub , placed nouveau.modeset=0 in there , reboot system no luck.

after couple of hours figured tty way how can working again, right? have suggestion how open tty , rid of login loop? appreciate every reply.

thank you!

edit when place nouveau.modeset=0 in grub , reboot, come: /dev/sda8:clean, 412123/3055616 files, 2982833/12207104 blocks

when on screen, i'm unable type , after couple seconds normal login screen appear , i'm still unable open tty.

-cecily

ctrl-alt-f1 terminal. login shut down graphic interface:

sudo service lightdm stop

then update:

sudo apt-get update

then rid of nvidia stuff:

sudo apt-get purge nvidia-*

then try:

sudo apt-get install nvidia-340

sudo reboot

hope helps! from-memory suggestion on similar issues i've had.