What are the most important partitions (in "Something else" installation) when i want to dual boot ubuntu 20.04 and windows 10 ?. My pc info: Boot type = UEFI , Laptop name = HP
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You cannot boot Windows installed on external drive. Grub will boot internal drive's installs, if fast start up off. The ESP - efi system partition & / (root) are required. Many want separate /home and/or data partition(s). UEFI/gpt partitioning in Advance, new versions do not need swap partition: http://askubuntu.com/questions/743095/how-to-prepare-a-disk-on-an-efi-based-pc-for-ubuntu & https://help.ubuntu.com/community/UEFI & https://askubuntu.com/questions/1296065/dual-booting-w10-ubuntu-with-2-separate-ssds-in-uefi-mode/1296153#1296153 – oldfred Dec 21 '20 at 14:48
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@oldfred: You can install Windows-to-Go on an external drive, even on a USB flash drive, You can then install Ubuntu next to it on the same drive. Rufus will install WtG, I think Universal will too. I can find no difference between Windows and WtG. – C.S.Cameron Dec 22 '20 at 00:22
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It looks like Windows-to-Go is being discontinued. https://en.wikipedia.org/wiki/Windows_To_Go And it was for Enterprise (or Education) versions. – oldfred Dec 22 '20 at 04:33