An error occurred while updating sleeping dogs disk io failure

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.

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).

For this do the following: Note that if the problem occured after installing an unsupported driver from the amd site then you may have to first delete the driver you had installed.

For this, run in the tty session (i.e) in the terminal screen you get after pressing Now you must get back access to the Unity desktop(Of course with the AMD driver uninstalled).

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).Then after downloading your driver installer(the file) get to this site and follow the instructions to install your driver.Your driver must be installed and it should work successfully.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).

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