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Dual-booting as an intermediate phase for fully switching OSs
(lemmy.dbzer0.com)
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But will I be able to eventually remove OS #1 and switch to the one installed afterwards?
Yes, you just boot a live USB and use GParted to delete what you don't want anymore and grow the rest.
Based. Btrfs it is. Sounds like a really cool filesystem.
If you're using BTRFS and know how to/are prepared to learn, just create separate sub volumes instead of multiple partitions. Means that you don't need to decide how to split up space between different partitions and they are easy to delete without a live USB.