error in the first boot after installation. [failed unmounting var.mount - /var]

Guys I’m a newbie with Linux and trying to install bazzite os expecting to have a similar experience as steam OS.

I’m trying to get a dual boot with windows 11 and after formatting the disk and setting the efi and var partitions following a YouTube tutorial . I’m getting this screen saying

“failed unmounting var.mount - /var

I don’t have internet connection for this installation because my WiFi card from Broadcom (bcm94360ng) wasn’t compatible at first. I had Switched the original WiFi card for hackintosh purposes. (Still have it in a second ssd)

I don’t know if this error is related to the fact that the installation don’t have internet access.

My setup:
Mobo: asus 760i
Intel i7 13700k
Gpu amd 6950xt
Dell 4k monitor

I was intending to fix the WiFi problem using the following command:

just use-Broadcom-wl

found on a bazzite discourse post. https://universal-blue.discourse.group/t/bazzite-buzz-3/25

Could anyone have clues on how to fix this? Thx in advance.

later edit:

The steps used to create the partition:
  1. shrinked the disk space on windows (for dual boot)
    in the installation process selected the available free space:
  2. created a mountpoint /boo/efi with EFI system partition | 300mb
  3. created a mountpoint /boot with ext4 file system | 1gb
  4. created a btrf file system with the remaining file space.
  5. selected the folder with btrf and then created the following mointpoints
    5.1 /
    5.2 /var
    5.3 /var/home
  6. applied all the changes and procceded the installation without selecting the internet acess point.
  7. rebooted and got a screen to select between continue boot, install mok and and 2 other options.
  8. got the errors described abobe and in the image.
IMG_5818.jpg
Universal Blue
Bazzite Buzz No. 3 Type "just" in a host terminal to see a list of custom convenience commands. Welcome to Bazzite Buzz #3! Bazzite is a custom image of Fedora 38 designed to bring the best in Linux gaming to your PC and handheld devices. This newsletter highlights all the work we are working on over the past few weeks. If you are new to a ...
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