Ok, let's see. You mast have boot conflicts. After update some services can start when you boot your system, as openvas was updated few days before, i guess your system start some of openvas services in boot.
Open terminal and run:
Then copy all and run in terminal :
update-rc.d -f greenbone-security-assistant remove;
update-rc.d -f openvas-administrator remove;
update-rc.d -f openvas-manager remove;
update-rc.d -f openvas-scanner remove;
Reboot your system, and openvas will start from menu.