Fix regex not working

[Ordeeper]

Problem

2. Set lightdm greeter session to webkit2.

Set default lightdm greeter to lightdm-webkit2-greeter

sudo sed -i 's/^\(#?greeter\)-session\s*=\s*\(.*\)/greeter-session = lightdm-webkit2-greeter #\1/ #\2g' /etc/lightdm/lightdm.conf

this doesn't work due to ? which is not supported in sid

Solution

sudo sed -i 's/^#\{0,1\}greeter-session\s*=\s*\(.*\)/greeter-session=lightdm-webkit2-greeter #\1/g' /etc/lightdm/lightdm.conf

you may use * instead of {0,1} also

[Ordeeper]

The error of not being able to locate the greeter configuration in LightDM is caused by comments in the greeter-session as I have noticed.