boot – The ubuntu 20.04 stucked at the starting screen

Ubuntu stucked as my computer shut down automatically I think because of some power failure i tried going to recovery mode f.. I dont remeber command its not working showing an error that the disk is mounted and when I tried to reboot again the ubuntu again stucked at the spinning symbol any solution for this ?
And I had installed the sys yesterday and its showing disk space full although i have allocated 90 gb to it i think some process stucked and it happen, I am beginner at the ubuntu anyone please help!!