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This means that you can connect to it via the x2goclient to enjoy a regular desktop experience. To connect, launch x2go and create a new session and specify that you want to connect through your SSH proxy as shown below. Be sure to select "MATE" as your Session Type on the bottom.
LDAP
The LDAP serves both as a user management system and as your internal DNS nameserver. The best way to get familiar with it is to connect to it.
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