pick up a phone and call the systemadministrator there
or go to the university personally

o if it is a vps then you will have a seperate control panel to remotely reboot the server as well.

yes, I should wait till morning.
and about vps, I have not the vps control panel.

After installing mcrypt I must reboot the apache web server, I think. but I reboot the physical server.

Just for future reference:

There is only one reason to ever reboot a Linux system, and that's a kernel upgrade. OK, a hard lockup of some sort in the kernel is also a good reason. But again...only kernel issues should ever be answered with a reboot. Obviously, rebooting a system should work--you never know when you'll need to reboot for a kernel upgrade. But, it's not something you do for random configuration changes. It's a bad habit to be in, and a waste of your time. Linux and UNIX are not Windows. Rebooting is not something you should expect to do often...certainly not when modifying Apache configuration.