Request for explanation of error message

[Ralf Mardorf]

FWIW those are the log file sizes of my several years old Ubuntu 16.04:

[root at archlinux rocketmouse]# ls -hAl /mnt/moonstudio/var/log/lightdm/
total 17M
-rw------- 1 root root  14M Jul 28 20:56 lightdm.log
-rw------- 1 root root 7.4K Jul  7  2016 lightdm.log.old
-rw------- 1 root root 241K Jul 22 13:55 seat0-greeter.log
-rw------- 1 root root  12K Jul 11  2016 x-0-greeter.log
-rw------- 1 root root  645 Jul  7  2016 x-0-greeter.log.old
-rw------- 1 root root 2.3M Jul 28 20:56 x-0.log
-rw------- 1 root root 1.1K Jul  7  2016 x-0.log.old
-rw------- 1 root root 1.2K Sep 10  2015 x-1-greeter.log
-rw------- 1 root root 1.2K Sep  9  2015 x-1-greeter.log.old
-rw------- 1 root root 1.3K Sep 10  2015 x-1.log
-rw------- 1 root root 1.3K Sep  9  2015 x-1.log.old

And this are the log file sizes of my several years old Arch Linux:

[root at archlinux rocketmouse]# ls -hAl /var/log/lightdm/
total 96K
-rw------- 1 root root 9.3K Jul 28 15:42 lightdm.log
-rw------- 1 root root 6.3K Jul 28 15:20 lightdm.log.old
-rw------- 1 root root  16K Jul 28 15:42 seat0-greeter.log
-rw------- 1 root root  16K Jul 28 15:20 seat0-greeter.log.old
-rw------- 1 root root  14K Jun 28  2016 x-0-greeter.log
-rw------- 1 root root  14K Jun 27  2016 x-0-greeter.log.old
-rw------- 1 root root 1.9K Jul 28 15:42 x-0.log
-rw------- 1 root root 1.9K Jul 28 15:42 x-0.log.old
-rw------- 1 root root 2.1K Feb 11 18:43 x-1.log

If nothing is broken, the log files are very small.