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15 years of DEBIAN starting from version 5 "Sid" until the recent 9.5 "Stretch".
Before that done 6 years of system administration including a SCO UNIX Server and a couple of Windows Servers and dozens of workstations. The largest system was nearly 100 PC's, devices etc. at 3 locations with LAN and VPN's, Firewall and Phone via landline and VoIP.

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DEBIAN - unable to start X Server

Posted 10-22-2016 at 05:21 AM by error_401

Sometimes it happens that x won't start

- No graphical interface login (kdm) (gdm) do not start
- Terminals are available except for #7 which normally is the x Server's
- When trying to start the x-Server from a console logged in as normal user we get errors
- Error is: unable to start core services

It may be a problem with a full harddisk.
It seems that the syslog can under some circumstances become quite large (several GB).
At some point the system has no more space to write the data to the HDD when starting the x-Server.

Reduce the log file size.

Eithe use a logrotate or cat the log file to /dev/null

The log files are located in the /var/log/ directory.

You can move the content of such a file into the data nirvana with cat. This empties the file but leaves the structure and permissions intact.
log in as root and perform the following command on the log files which are too large:

cat /dev/null > /var/log/syslog
You may want to consider backing up the log or look at it before to figure out why it has gotten to that size.
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