When selecting a device to boot an OS from you may see old entries for operating systems that have previously been installed on the drive - especially if you distro hop or have installed Windows before.

You can manage these options in Linux using efibootmgr. To view the current list of boot options run:

$ efibootmgr

That will return something like this:

BootCurrent: 0000
Timeout: 0 seconds
BootOrder: 0000,0005,0002,0006,0001,0003,0004
Boot0000* Fedora
Boot0001  USB NETWORK BOOT:
Boot0002* WDC PC SN720 SDAQNTW-512G-1001-183935806637
Boot0003* Wi-Fi IPV4 Network
Boot0004* Wi-Fi IPV6 Network
Boot0005  USB:
Boot0006  USB NETWORK BOOT:

If there’s an entry you want to delete, you can delete it as follows, where --bootnum is the number at the end of the first column. So Boot0004 is 4. Example below.

$ efibootmgr --bootnum 4 --delete-bootnum