Boot manager not opening with F2 key in acer aspire A315-31.please help me.

priyanshu13032003
priyanshu13032003 Member Posts: 3 New User
edited February 29 in 2018 Archives
I have Acer Aspire A315-31 with preinstalled endless os .I deleted it and put windows 8.1 in it .Everything was going correct. But when I tried to dual boot windows 8.1 and Ubuntu 14.04,it failed.I changed the boot priority order in boot manager.When I exit saving changes ,it showed security boot failed .When I wants to enter in boot manager to change boot priority order using F2,it doesn't opened .I entered windows through boot menu. Plz. Help me .