![]() ![]() ![]() Certainly true for 18.04, maybe not with 22.04. install on a UEFI boot PC and run on a legacy boot PC (or vice versa) - won't work.Use gparted for this, copy in the install iso.ĩ9% of the time it will work on a different PC. The fix is disconnect your system drive before install, or if difficult use gparted to disable the esp and boot flags on the EFI partition in your system drive, re-enable after install. It will put grub in the first EFI partition it finds not what you tell it. Be aware that with ubuntu and some derivatives, mint being one, there is a bug in the installer. You can just install to the usb drive as you would any other drive. Avoid legacy boot unless you have no alternative options. The other option may be using legacy boot however legacy boot has become widely undesirable due to hardware interface limitations of legacy boot.uefi provides a motherboard firmware interface commonly beneficial to or required for functional operation of modern pc hardware. The methods used to configure grub interactively can be universal for any distro that provides grub to be used. Without removable flag used to install grub the efi bootloader configuration relies on the specific disk cable and pc. The grub efi loader is detected by the motherboard bios and a bios boot entry should be automatically added if detected when the pc first boots. Most uefi operating systems including windows commonly use this similar config approach so the bootloader remains usable if a disk is moved to a different pc or disk connector. This creates the default directory defined by the UEFI specification, and then copies the grub圆4.efi file used to load grub itself to the 'default' EFI file location defined by the same specification. Grub-install -target=x86_64-efi -efi-directory=/boot -removable If you used uefi boot and install grub with the -removable subcommand configuration the disk that configuration was used with will become a portable installation.
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