Assistance with UEFI dualboot?

[apparatus]

@anon39129773

Qubes installer created a /boot, swap, /boot/efi and / (qubes_dom0-root). These mount points do not add up to 200GB, will I still have 200GB available for use in QubesOS?

Qubes OS installer should’ve allocated all the free space. There should be info at the bottom about free space available. If no free space available then Qubes OS will use all of these 200 GB.

@anon39129773

Underneath these mount points there is an “unknown” header that has all the windows partitions. The windows partition, however, has the same “/boot/efi” as the mount point Qubes installer created. Is this a problem and could it result in me being unable to boot windows?

Qubes OS can use the same EFI System partition as Windows, just make sure that you don’t select option to format the partition in the installer. I think this option is deselected by default.
Also the Windows creates EFI System partition with 100 MB size by default and it won’t be enough for Qubes OS usage, so you should resize the EFI System partition and make it e.g. 512 MB.
If you don’t resize this partition then you’ll have this issue:

Failed to update DOM0

Hi I’m using Qubes OS for a while now but in the past few days i encountered one issue. As i normally boot up i always check for new updates and everything is fine and up to date but 2 days ago when i was updating some templates and DOM0 the DOM0 just showed a red cross and a error that was saying that i don’t have enough space on the /boot/efi partition and that i need 2 or more MB to update, i would like to ask is there any command that would clean or delete old unneccessary files and make a s…

You can use gparted Live to do this:
GParted -- Live CD/USB/PXE/HD
Resize the EFI System partition before installing Qubes OS.