Ubuntu looks for a removed volume group during boot

I cloned my Ubuntu Server to a virtual machine on my laptop to do some tests. I adapted /etc/fstab and network configuration but I am unable to get rid of LVM. While the original server uses LVM, the clone has a single partition setup:

$ lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   64G  0 disk
└─sda1   8:1    0   64G  0 part /
sr0     11:0    1 1024M  0 rom

However, this is still showing during boot:

Volume group "vp11-testsrv-ubuntu-vg" not found
Cannot process volume group vp11-testsrv-ubuntu-vg

^{(I am sorry to post a screenshot of text. Is there any file where I can find these boot messages? I cannot find them in /var/log and the output of dmesg.)}

It’s probably just a warning and the boot continues successfully but I want to get rid of the LVM traces. How can I achieve this?

The commands pvs, vgs, lvs showed nothing and I even ran sudo apt remove lvm2 without problems but the boot messages are still there. I also removed lvm from GRUB_PRELOAD_MODULES in /etc/default/grub and ran sudo update-grub. I have only found traces of the server’s LVM in /var/log (old records from the original server) and the archive and backup subfolders of /etc/lvm.

This is my /etc/fstab. The commented items are related to the original server.

# <file system> <mount point>   <type>  <options>       <dump>  <pass>
UUID=cbd35c50-81be-4e7f-a412-d1f4bed90c00    /                    ext3    errors=remount-ro 0  1
# /boot was on /dev/sda1 during installation
#UUID=fb5493ef-7c3b-4009-9765-47969fb83b68 /boot                              ext3 defaults  0  2
#/dev/mapper/vp11--testsrv--ubuntu--vg-swap_1 none                            swap sw        0  0
#/dev/mapper/vp11--testsrv--ubuntu--vg-vboxes /home/virtbox/VirtualBox\040VMs ext3 defaults  0  2

It turns out that the traces of LVM were stored in initramfs. I found the question Can't find LVM root dropped back to initramfs and ran the mentioned command:

sudo update-initramfs -u -k all

Since that, the messages regarding LVM have no more been appearing during boot.