upgrade 7.4 to 8.1

In place upgrade of 7.4-17 with memtest86 installed to 8.1.4 hangs at Unpacking zfs-zed (2.2.2-pve1) over (2.1.14-pve1) ... Setting up memtest86+ (6.10-4) ... Installing new version of config file /etc/grub.d/20_memtest86+ ... root@pve3:~# ps -ef | rg '\bmemtest' root 412929 412928 0...