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### The GPU needs to remain plugged into a monitor (this is good for testing & troubleshooting).### The GPU needs to have a plug like the ones used in GPU Crypto mining installed to trick the card into thinking that a display is connected. === Scroll Wheel Scrolls in the Same Direction Regardless of Rotation ===
*''' Using an AMD GPU? '''
** After the end of the Radeon HD Series AMD started incorporating a feature into their GPU's that effectively puts the card to sleep when no display is connected. For this reason one of two conditions need to be met.
=== The Clipboard is not Working ===
* '''Are you using Wayland?'''
** Clipboard functionality is not compatible with Wayland. If you are using it you need to disable it for the clipboard to work.
=== Followed Installation Instructions but Looking Glass Still Doesn't Launch ===
At times depending on your distribution circumstances can cause Looking Glass to still not run. Below is a list of known issues that can prevent Looking Glass from running properly.
==== AppArmor ====
AppArmor is a security application that can prevent Looking Glass from running. How to add security exceptions may vary on your distribution:
===== Debian(Ubuntu) =====
Start by opening the file <code>/etc/apparmor.d/abstractions/libvirt-qemu</code>. Now locate and edit the following lines to represent how they appear in the example:
<syntaxhighlight lang=text>
# for usb access
/dev/bus/usb/** rw,
/etc/udev/udev.conf r,
/sys/bus/ r,
/sys/class/ r,
/run/udev/data/* rw,
/dev/input/* rw,
# Looking Glass
/dev/shm/looking-glass rw,
</syntaxhighlight>
Save, exit, and restart AppArmor:
<syntaxhighlight lang=text>
sudo systemctl restart apparmor
</syntaxhighlight>
