This issue occurs when the OS tries to boot with a non-standard VGA driver. To prevent this issue, we need to add and modify some grub options. Restart the node, and then press the E key from the Proxmox boot menu. At the end of the Kernel boot line, add the following nomodeset, as shown in the following screenshot:

Press Ctrl + X or F10 to boot the node normally. To make this option permanent, make the following modifications in /etc/default/grub:

• Uncomment GRUB_TERMINAL=console
• Comment out GRUB_GFXMODE=some_X,some_Y