KVM install and configuration on Kubuntu

sudo apt install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils virt-manager

groups                    List groups for the current user.

groups <username>   List groups for a specific user.

id <username>    Display UID, GID, and all group memberships.

cat /etc/group            Show all local groups and their members by reading a file.

getent group            List all groups from all configured databases.

sudo adduser $USER libvirt

Virtual Machine Manager > File > New Virtual Machine > Local Install Media (ISO image or CD-ROM)

If failed to create image, create image.qcow2 in storage location and then choose it for OS install.

sudo nano /etc/libvirt/qemu.conf

# Some examples of valid values are:

#

#       user = "qemu"   # A user named "qemu"

#       user = "+0"     # Super user (uid=0)

#       user = "100"    # A user named "100" or a user with uid=100

#

#user = "libvirt-qemu"

# The group for QEMU processes run by the system instance. It can be

# specified in a similar way to user.

#group = "kvm"

user = "your_username"

group = "your_username"

user = "your_username"

group = "libvirt"

sudo systemctl restart libvirtd

Network selection > Bridge device... > virbr0

ifconfig

On KDE couldn't turn off full screen with shortcuts... but right mouse button > tick full screen > untick full screen... Changing window size and position with shortcuts started working.

dpkg-query -W -f='${Installed-Size} \t ${Package}\n' virtualbox*

qemu-img convert -f vdi -O qcow2 /path/to/your/vm.vdi /path/to/new/vm.qcow2

sudo apt purge "virtualbox*"

sudo apt autoremove

Rescue mode without graphics:

sudo grub-install /dev/vda

sudo update-grub