I have a huge problem with my moodle server. please help me if you can:
I have an ubuntu server 16.04 LTS and a moodle server 3.5.1.
after i upgraded my ubuntu server to 18.04 LTS i'm unable to use the administrative zone in my moodle server. I got as an sort of error: "Moodle requires the xml PHP extension. Please install or enable the xml extension."
If I enter and account is ok...I can use the moodle as a regular user/student. but can not administrate anything on the moodle-server side.
I don't know what to do...any advice welcome!
Thank you very much!