Is there an issue with grub for dual boot?
I would go into the reasons for choosing to dual boot but nobody cares so I'll get to the point.
Been trying to dual boot, used an old cheap laptop (ThinkPad x260) I had with windows sata SSD as a trial.
Cleared 80GB space for it
Used ventoy and 2026.08.01 iso
Used cfisk to create the following:
a) sda5, 1GB, efi
b) sda6, 30GB, Linux filesystem
c) sda7, 49GB, Linux filesystem
Formatted sda5 as f32
Formatted sda6 as ext4
Formatted sda7 as ext4
Mounted sda6 as /mnt
Made /mnt/boot and /mnt/home with mkdir
Mounted sda5 as /mnt/boot and sda7 as /mnt/home
Went into archinstall and did the basics like swap, pipewire, account, root password, chose Linux and Linux lts for my kernel
Went into disk configuration and put the root mount directory as /mnt
Put my bootloader as grub (only two options)
Chose my DE and GPU driver
Chose install and then it comes up with an error that I can't read in time and then I can't do the appropriate stuff with grub to recognise the other efi, something about the system not supporting it when I've used the laptop to install arch before
After all that, tried rebooting and it goes straight to windows, can't change bootloader in bios (presumably because there's only the windows one due to the error)
I've heard of grub not being very suitable for dual booting and I've tried looking at tutorials but following them doesn't change it. I'm too much of a moron to understand the wiki so that isn't really an option so I'm confused.
One of the other tutorials recommended refind but my archinstall doesn't have that, even after updating it so I assume it's not normally used