80% of harddrive, so i did "rm -fr ~/user/.blah/trash" and followed up with another df -h showing 14%, so a final reboot and i was back in.
Will try to answer the ones I can: Assuming the answer by Jokerdino was already checked: The greeter is invalid This happens when a driver has a problem installing correctly (Most cases).
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I also need to add that I do not recommend downloading the Drivers from the Nvidia site since they: one.
These are tested and approved already for the Ubuntu version you are using and will give less errors and incompatibility bugs.
For Intel it is recommended to do the following after doing all the steps mentioned above but before installing anything (When you are in the Terminal).
limited to installation of wrong drivers, incorrect or invalid lightdm greeters, low disk space, incorrect installation of graphics card like ATI and Nvidia, incorrect configuration of file while setting up multiple monitors among others.
If you are experiencing the "low-graphics mode" error when trying to login but none of the following answers work for you, please do ask a new question and then update the answers of this canonical question as and when your new question gets answered.
ok i tried everything on this page, but the fix for me was to make some more room.
"df -h" showed sda1 as 100% so then i run "du / | sort -g" and found trash was like 30gig...
Then you can get to this site which clearly helps in choosing the right AMD driver for your System specifications.
Also read the release notes for the latest driver for your graphic card(Especially check if your system satisfies all the system requirements).