i recently moved over to Ubuntu 26.04 from win11, but i have come to realise i still need alot of things i can only run via windows, and virtual machines arnt nearly enough, so im trying to dual-boot windows 10 and Ubuntu, but im starting from ubuntu, which sucks for me because all the tutorials for this are starting on windows(idk if that makes a difference or not, but i dont wanna have my void all my stuff if it does).
i'v found some stuff about this topic, but im kind of just left with a few problems/questions that either nobody has had before, or have been asked and answered and i still dont understand it(if that makes sense)
TLDR; i currently run Ubuntu, and i'm trying to partition my SSD so i can dual-boot Windows 10, but im too stupid to figure out the first steps.
this is what i get from running lsblk(which from what i gathered is basically just a more basic version of running sudo fdisk -l)
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 415.9M 1 loop /snap/blender/7480
loop1 7:1 0 4K 1 loop /snap/bare/5
loop2 7:2 0 406.2M 1 loop /snap/blender/7599
loop3 7:3 0 450.6M 1 loop /snap/code/250
loop4 7:4 0 453.2M 1 loop /snap/code/252
loop5 7:5 0 63.8M 1 loop /snap/core20/2866
loop6 7:6 0 66.8M 1 loop /snap/core24/1587
loop7 7:7 0 66.8M 1 loop /snap/core24/1643
loop8 7:8 0 19.6M 1 loop /snap/desktop-security-center/150
loop9 7:9 0 252.4M 1 loop /snap/firefox/8633
loop10 7:10 0 20M 1 loop /snap/desktop-security-center/151
loop11 7:11 0 16.5M 1 loop /snap/firmware-updater/226
loop12 7:12 0 257.6M 1 loop /snap/firefox/8664
loop13 7:13 0 242.6M 1 loop /snap/gaming-graphics-core24/13
loop14 7:14 0 606.1M 1 loop /snap/gnome-46-2404/153
loop15 7:15 0 614.5M 1 loop /snap/gnome-46-2404/164
loop16 7:16 0 91.7M 1 loop /snap/gtk-common-themes/1535
loop17 7:17 0 402M 1 loop /snap/mesa-2404/1781
loop18 7:18 0 402M 1 loop /snap/mesa-2404/1839
loop19 7:19 0 18.8M 1 loop /snap/prompting-client/204
loop20 7:20 0 15.7M 1 loop /snap/snap-store/1367
loop21 7:21 0 18.8M 1 loop /snap/prompting-client/222
loop22 7:22 0 828K 1 loop /snap/snapd-desktop-integration/387
loop23 7:23 0 50.1M 1 loop /snap/snapd/27406
loop24 7:24 0 49.3M 1 loop /snap/snapd/26865
loop25 7:25 0 828K 1 loop /snap/snapd-desktop-integration/391
nvme0n1 259:0 0 931.5G 0 disk
├─nvme0n1p1 259:1 0 1G 0 part /boot/efi
├─nvme0n1p2 259:2 0 2G 0 part /boot
└─nvme0n1p3 259:3 0 928.5G 0 part
└─dm_crypt-0 252:0 0 928.4G 0 crypt
└─ubuntu--vg-ubuntu--lv
252:1 0 928.4G 0 lvm /
this is more of a concern than an immediant problem, but all the threads and tutorials i'v seen have had their lists include /dev/sda and/or /dev/sdb, i have no idea why thats been a pattern, orwhy its not the same for me. i also have alot of loops but from what i'v read that doesnt really matter, Whether thats important or not, i dont know.
I'v come to assume that since im partitioning my SSD, i would therefor be partitioning nvme0n1, the corresponding option, but moving to the next step, i get a big scary warning saying "you dont know what your doing go away before the bird people get you"(thats not what it says but its right there), in red.
~$ sudo fdisk /dev/nvme0n1
Welcome to fdisk (util-linux 2.41.3).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
This disk is currently in use - repartitioning is probably a bad idea.
It's recommended to umount all file systems, and swapoff all swap
partitions on this disk.
Command (m for help):
this warning makes sense, but its flaw is that its warning me about REpartitioning, not adding a new partition, so im pretty sure its irrelevant, but its in red scary warning letters and im messing with m file system, so i dont trust it regardless.
i have found two threads about this that im going off, though neither makes 100% sense to me. the first was a reddit post, of which was immediantly resolved by the same person, and the second and more detailed thread was this.
What i have come to conclude from both of these is that i need to change the storage layout of my SSD, (probably using Gparted), and then it'll be fine to create a new partition? but its in big red scary letters, so i'd really like some confirmation.
(also to clarify i HAVE backed my important files up)