How do I boot Alternate OS on every boot?

Definite Rocker

10/7/23, 6:57 AM

I have done dual boot in my laptop. My Ubuntu is on 0 and Windows is on 2. I have updated following settings in /etc/default/grub:

GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true

and in /etc/grub.d/00_header I have changed these lines:

if [ "x${GRUB_DEFAULT}" = "x" ] ; then GRUB_DEFAULT=0 ; fi
if [ "x${GRUB_DEFAULT}" = "xsaved" ] ; then GRUB_DEFAULT='$(expr ${saved_entry} % 4)'
 '{saved_entry}'='$(expr ${saved_entry} + 2)' ; fi
if [ "x${GRUB_TIMEOUT}" = "x" ] ; then GRUB_TIMEOUT=5 ; fi
if [ "x${GRUB_GFXMODE}" = "x" ] ; then GRUB_GFXMODE=auto ; fi

if [ "x${GRUB_DEFAULT_BUTTON}" = "x" ] ; then GRUB_DEFAULT_BUTTON="$GRUB_DEFAULT" ; fi
if [ "x${GRUB_DEFAULT_BUTTON}" = "xsaved" ] ; then GRUB_DEFAULT_BUTTON='$(expr ${saved_entry} % 4)' ; fi
if [ "x${GRUB_TIMEOUT_BUTTON}" = "x" ] ; then GRUB_TIMEOUT_BUTTON="$GRUB_TIMEOUT" ; fi

but its throwing error as follows:

/etc/grub.d/00_header: 41: {saved_entry}=$(expr ${saved_entry} + 2): not found

What could be the solution so that ${saved_entry} is incremented by 2 in every boot? Also after reaching at 50 i want it to reset to 0

0 + 0

boot

grub2

dual-boot

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: How do I boot Alternate OS on every boot?

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