1. Download LMDE.iso
2. Install unetbootin
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apt install unetbootin
3. Boot into any live CD, go to GParted and resize your current Mint partition to as small as you can and format the newly created space as EXT4 (or whatever file system you want to use)
4. Boot back into the installed Mint
5. in a terminal
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sudo cp /boot/grub/grub.cfg /boot/grub/grub.cfg.bac
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gksudo gedit /boot/grub/grub.cfg
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menuentry "Linux Mint Debian Installer" --class linuxmint --class gnu-linux --class gnu --class os {
set root='(hdX,Y)'
linux /casper/vmlinuz ro boot=live live-media-path=/casper quiet splash --
initrd /casper/initrd.lz
}
DONT CHANGE ANYTHING ELSE IN THIS FILE
7. Reboot and boot into the new option on the grub screen. Its important not to have any other external media attached at this point
8. Install LMDE as normal, using the new partition created earlier. NOTE: when the installer asks you to install grub, either untick it (as I did as I was concerned to mess up grub, just in case, and besides, its already installed) or make sure it is set to your harddrive (probably sda), not the memory stick you are installing off of.
9. Reboot and go back to your original installation, run
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sudo update-grub
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sudo cp /boot/grub/grub.cfg /boot/grub/grub.cfg.bac2
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gksudo gedit /boot/grub/grub.cfg
10. boot into a live Cd and use GParted to delete the old LM9 installation and extend the LMDE partition to use all the space
11. in a terminal (still on live CD), run
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sudo update-grub
"UUID" - this step is taken if your UUIDs in your menu entrys do not match. (I have no idea why this happens)
On your original installation, goto GParted (it may not be installed, in which case
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apt install gparted
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gksudo gedit /boot/grub/grub.cfg
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Taken and edited from here http://bobpeers.com/linux/hard_drive_install and here http://www.instantfundas.com/2007/08/in ... -from.html and my own experiments!!
if you have any issues let me know!