Installing Mobian --> "Resizing file system" forever

[kqlnut]

I had the same problem, even after reflashing the image multiple times (a nightly image a couple of weeks ago, flashed it with bmaptools). I could solve it by resizing the partition manually before putting the SD card in the phone for the first time. Make sure to use the right method for the file system type (in the linked instructions "resize2fs" is used, but Mobian uses F2FS, so you have to use "resize.f2fs"). I grew the partition with parted and resized it with resize.f2fs.