Linux Mint fails to install GRUB

I'm a complete beginner.

I recently wanted to try to dual-boot my computer that already had Windows 11 on it, adding Linux Mint. I created a USB using Rufus, choosing GPT, as my system is recent. I disabled Secure Boot, and made sure my computer didn't have BitLocker. Afterwards, I booted with the USB using Windows' "Advanced Restart" feature. I then Installed Linux Mint as usual, choosing to keep Windows Boot Manager. I let 100GB for Linux, and the rest for Windows. However, coming to the end of the install, I got a fatal error saying:

It then said that Linux Mint was installed successfully and prompted to restart now. However when I did, I obviously got booted back to Windows. I installed Grub2Win, but it couldn't detect Linux Mint, despite detecting a Linux Filesystem. Please help!