I had the grub "error: out of memory" issue after upgrading Ubuntu to
22.04 from 21.10. I used a Live USB of Ubuntu to chroot into my system
and after many trials and failures, I could get past the issue by
changing line 36 in /etc/initramfs-tools/initramfs.conf by using a
different compression choice
#
# COMPRESS: [ gzip | bzip2 | lz4 | lzma | lzop | xz | zstd ]
#
COMPRESS=zstd
However, this was still not a fix as zstd provided a quicker boot
previously than any other but was failing now. Yet from there it seemed
it was a compression issue. Changed it back to zstd and went to another
fix.
I further learned that zstd had defaulted to a lower compression value
in /usr/sbin/mkinitramfs at 1 instead of 19 in Ubuntu 22.04. I changed
line 196 to 19 compression
zstd) compress="zstd -q -19 -T0" ;;
Instead of
zstd) compress="zstd -q -1 -T0" ;;
Problem solved from proper chroot and updating grub2 after changing line
196 of /usr/sbin/mkinitramfs for my system.
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https://bugs.launchpad.net/bugs/1842320
Title:
Out of Memory on boot with 5.2.0 kernel
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