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During the install, you may need to reboot multiple times. (Sometimes you fail to boot over and over...)

After a while, typing the same 8 boilerplate mount commands every time you reboot back into the LiveCD environment gets overly time consuming.

The solution? Make a script to make your life faster and easier. Actually I've already made one, Here is how you would use it:

1 - Run the main mount command for your root partition, (use the specific disk partition that applies to your system)

This is the main command you should still run by hand, (this is done manually still because it has to know where to store/access the script)

root #mount /dev/nvme0n1p3 /mnt/gentoo
root #cd /mnt/gentoo

2a - Either, Download and save the script in this mounted root directory.

root #wget -O

2b - Or, Alternatively copy and paste it from this wiki:

root #nano
mount --types proc /proc /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --make-rslave /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
mount --make-rslave /mnt/gentoo/dev
mount --bind /run /mnt/gentoo/run
mount --make-slave /mnt/gentoo/run

3 - Make it executable

root #chmod a+x

4 - Execute it! Done! (the ./ is needed - means run from current directory)

root #./

Now everytime you reboot, repeat only Step 1 and Step 4.

It will be saved in the root directory of your gentoo partition.

From there you can "chroot /mnt/gentoo" to enter the chroot.

And "mount /boot" to mount your other important disks/partitions, using fstab, once you are inside.