I craft my boot device by hand. I'm using files filched from some
Ubuntu distribution (so, GRUB2), lately booting with the ISO file. I've
booted from an external (USB) hard disk, and from thumb drives.
On my external hard drive, I copied vmlinuz and initrd to the ESP
(because on another machine, with Secure Boot enabled, the version of
GRUB2 I filched does not support NTFS filesystems, and I cannot insert
the appropriate module). The ISO file is in a subdirectory of an NTFS
partition. The GRUB2 item is:
set bdir=(${root})/boot
set fsd=/os/boot
menuentry "Ubuntu 20.04.2 64-bit via ISO" {
set gfxpayload=keep
set ubdir=${bdir}/ubuntu200402-64
set isopath=${fsd}/ubuntu-20.04.2-desktop-amd64.iso
linux ${ubdir}/vmlinuz boot=casper iso-scan/filename=${isopath} ignore_uuid
fsck.mode=skip
initrd ${ubdir}/initrd
}
So, GRUB is told to load the kernel and initrd from the FAT-
formatted ESP, while the kernel is told to find the ISO file.
I observed the same behavior with 20.04.1 as with 20.04.2.
I observed the same behavior when booting from a thumb drive as when
booting from a hard drive.
I haven't tried to find a copy of "20.04". Was there such a thing?
Or was 20.04.1 the first released version, the one referred to in all
those posts complaining about the automatic disk check?
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https://bugs.launchpad.net/bugs/1875548
Title:
Its not easy to determine how to skip the filesystem check
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