I am really not familiar with linux, and only started using it recently, so be patient with me. I am trying to control a camera on regular intervals through a script that is called upon in the crontab. When I start up the computer, I can open crontab, edit and save, and everything is executed correctly. However, I can never open crontab a second time, unless I restart the computer first. If I type crontab -e, I get a blank page, located in the /tmp directory. I can enter my commands in there, but cannot save it.
I don't know if this is relevant, but when I try sudo crontab -e, I get something like "no cron installed for root".
Any help is really appreciated!
 Problem solved: the problem was the editor (gedit), when using nano as editor, I can access crontab, edit and save without problems!