I move my Ubuntu vm disk from one thinpool to another then I have increased my this vm disk from 200 to 400, and then I rebooted for it to regconize the new config, but it cannot boot anymore. Please help me, thank you guys !!!
You're using a UEFI BIOS, where is the EFI disk with the pre-enrolled keys?
Merely resizing the disk up at the host level should not break boot. Did you try doing any kind of resizing in-vm, like with Gparted, or using LVM commands?
#1 question: IS THE VM BACKED UP?
I would recommend downloading the following and try booting them in order in that VM: