Dual Boot - btrfs Manjaro - grub not remembering last boot

[byron4120]

When my system installed Manjaro on ext4 partition - and with proper update of grub template - it would remember the last OS booted. With btrfs install - grub provides an error on boot and only defaults to Manjaro. Still can boot others in list. Are there fixes for this so grub remembers last boot on btrfs installs?

[Mirdarthos]

Hi @byron4120,

Please provide the output of:

cat /etc/default/grub

Edit:

Also, what is the error you get when booting?

[Tomek]

@byron4120

grub remembers last boot

@byron4120

With btrfs

As far as I know it’s unsupported if /boot partition is btrfs

Grub can not remember the last selection

This can´t be used with btrfs Won´t fix Because grub can read btrfs, but grub can´t write to btrfs. https://wiki.archlinux.org/title/GRUB/Tips_and_tricks#Changing_the_default_menu_entry

[Mirdarthos]

Who around here knows &*&* 'bout BTRFS?

_{At least I know it stands for B-tree file system.}

[Nachlese]

The link @Tomek posted goes directly to section 9.3 of the Arch wiki.

Just above it, section 9.2, states why this may not work with BTRFS:

Recall previous entry
…
This will only work if /boot is not a btrfs, because grub cannot write to btrfs. But it will generate a misleading error message: “sparse file not allowed. Press any key to continue.”.

[byron4120]

Thanks all – I guess we wait until btrfs writes are enabled. Not a biggie but nice to have. We can set the default boot.

byron