#boot issue

I've been using Ubuntu for a while now and recently I've run into a boot issue. When I try to start up, it gets stuck on the loading screen. I've tried rebooting and it doesn't seem to make a difference. Has anyone else had this problem?? I've checked the disk for errors and it seems fine. The only thing I've done recently is install some updates, but I'm not sure if that's the cause. Can someone help me figure out what's going on?