System restarts when I open a pdf from my SSD Ext Hard Drive

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Hi again, @jame :slight_smile:

You wrote:

Ah, right! To open "Pluma" with administrator (superuser) privileges, I suggest that you open "MATE Terminal" (it's located in the "System Tools" section of the MATE menu). When the Terminal window opens, run the following command inside that window:

sudo pluma /etc/X11/xorg.conf.d/20-intel.conf

That command should prompt you to enter your password. After you enter your password, it should open Pluma as a superuser and put you inside a new empty file called "20-intel.conf" inside the "/etc/X11/xorg.conf.d/" folder. Copy and paste the lines that I wrote in my previous message inside that empty file. Here are those lines again, for easier reference:

Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "TearFree" "true"
EndSection

Save the file in Pluma, exit Pluma and then reboot the computer. After the reboot, log in again with your user and try again to open the PDF file from the SSD external hard drive, to see if this solved your problem of being automatically logged out when you open those PDF files. Please, report again later to tell us if doing that has solved (or not) your issue :slight_smile:

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