If you need to perform a system restore but you can't access the system GUI, you can use the command line System Restore tool.
Procedure
Once logged on to the command line as root, use the command:
# /usr/bin/smoothwall/systemrestore list
To start the tool. There will be output like this:
System Restore
--------------
ID: 613 09 Apr 2019 11:21:59 - Automatic restore point version: 11 (Leeds) revision: 12
Find the ID of the restore point to revert to and run the following command:
# /usr/bin/smoothwall/systemrestore restore <ID number>
Once finished, run the reboot command:
# reboot
Note: Running just the command:
# /usr/bin/smoothwall/systemrestore
This will show a list of additional actions and options available.