1.3 Now, you decide you want to install another Linux OS using Calamares Linux OS installer on your target disk, ‘USB Flash Target’ (say 64GB). For this you first need to shrink the LUKS or LUKS-LVM root partition of Ubuntu OS on the target disk, ‘USB Flash Target’ (say 64GB). Its possible to do this using ‘lvreduce’ provided the target disk is not all full i.e. when you boot into Ubuntu OS target disk, ‘USB Flash Target’ (say 64GB) you see free space on the disk, and this free space is the limit to which you can reduce the size by. How to do this? Boot into the working system of bootable live Ubuntu OS installer ‘USB/microSD Bootable Live Linux OS’ (small usually 4to8GB) (see Note 1 and Note 2 on how to achieve this), and type the ‘lvreduce’ code sequence to reduce size of target disk ‘USB Flash Target’ (say 64GB) by 20GB. Reboot computer and you will find that the size of the target disk, ‘USB Flash Target’ (say 64GB) has been reduced.
###Source###
This is video 1.3 of article: https://fairwissenschaft.eu/2026/04/installing-two-linuxos-as-multi-boot-scenario-ubuntu-plus-one-parrot/
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Copyright © 2023 onwards Goldy Honorer-Descartes (born Shradha Mukherjee)
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