OS X Base System locked

[dunceclown]

I'm trying to reboot my computer, and when I go to download macOS Sierra, the disk is locked, and I can't unlock it in Disk Utility, the only options there are First Aid and Info. Thanks in advance!

 

[Weaselboy]

That base system is a virtual image of the installer and is supposed to be locked. Can you explain more what you have tried and why you are doing this to begin with?