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Avoid sddm-greeter to have high CPU usage

Summary

My iMac having Ubuntu kept having high CPU usage with the program sddm-greeter.

Solution

Amending the file /etc/security/pam_env.conf fixed up the issue :

/etc/security/pam_env.conf
======
#
# Avoid high cpu usage with sddm-greeter
# https://github.com/sddm/sddm/issues/323
QT_QUICK_BACKEND DEFAULT=software
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