I used a live OS to get the file and the error lines are:
EE) systemd-logind: failed to get session: The name org.freedesktop.login1 was not provided by any .service files
(EE) Failed to load /usr/lib/xorg/modules/drivers/radeon_drv.so: libglamor.so.0: cannot open shared object file: No such file or directory
(EE) Failed to load module "radeon" (loader failed, 7)
(EE) Failed to load module "fbdev" (module does not exist, 0)
(EE) Screen 0 deleted because of no matching config section.
(EE) Device(s) detected, but none match those in the config file.
Fatal server error:
[ 45.168] (EE) no screens found(EE)
[ 45.168] (EE)
Please consult the The X.Org Foundation support
any idea - how to fix it ?