I have updated Ubuntu 16.04 LTS, because with each start of my computer on 16.04 the folders and files are locked. I used to solve them with "fsck / dev / sdaX" where X is the partition number, d. H. Sda1, sda2, etc., and my system rebooted, but it wasted a lot of time. I tried to solve this problem in different ways, but I could not. So I upgraded my operating system in the hope that it would solve this problem.
When installing the updates, tty1 appeared in the middle of the login screen and I logged in and rebooted the system because nothing happened after login. However, after the restart, the login screen will not be displayed. Instead, it sticks to a purple screen with a dot under the Ubuntu logo.
I tried recovery mode via GRUB, enabled the network and selected root, entered the root password, but then, when executing commands such as "sudo apt-get plymouth remove", "sudo apt-get lightdm install" and so on. They will not execute and the system will propose me commands, but if I use suggested commands, they will not be executed either.
(I know it's a duplicate, but my problem is not solved by answering the previous question like this) Technically, it's not a duplicate, I'm a software developer and can not lose my data, and I have to go back to mine Development return environment as soon as possible.)