ubuntu@lp1880541-f:~$ dpkg -l udev|grep udev ii udev 245.4-4ubuntu3 amd64 /dev/ and hotplug management daemon ubuntu@lp1880541-f:~$ sudo groupadd kvm groupadd: group 'kvm' already exists ubuntu@lp1880541-f:~$ grep kvm /etc/group kvm:x:108: ubuntu@lp1880541-f:~$ sudo groupdel kvm ubuntu@lp1880541-f:~$ grep kvm /etc/group ubuntu@lp1880541-f:~$ sudo groupadd kvm ubuntu@lp1880541-f:~$ grep kvm /etc/group kvm:x:1001: ubuntu@lp1880541-f:~$ sudo apt install udev Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: libudev1 The following packages will be upgraded: libudev1 udev 2 upgraded, 0 newly installed, 0 to remove and 31 not upgraded. Need to get 1440 kB of archives. After this operation, 2048 B of additional disk space will be used. Do you want to continue? [Y/n] y Get:1 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 udev amd64 245.4-4ubuntu3.1 [1362 kB] Get:2 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libudev1 amd64 245.4-4ubuntu3.1 [78.3 kB] Fetched 1440 kB in 1s (1423 kB/s) (Reading database ... 66302 files and directories currently installed.) Preparing to unpack .../udev_245.4-4ubuntu3.1_amd64.deb ... Unpacking udev (245.4-4ubuntu3.1) over (245.4-4ubuntu3) ... Preparing to unpack .../libudev1_245.4-4ubuntu3.1_amd64.deb ... Unpacking libudev1:amd64 (245.4-4ubuntu3.1) over (245.4-4ubuntu3) ... Setting up libudev1:amd64 (245.4-4ubuntu3.1) ... Setting up udev (245.4-4ubuntu3.1) ... The group `kvm' already exists and is not a system group. Exiting. dpkg: error processing package udev (--configure): installed udev package post-installation script subprocess returned error exit status 1 Processing triggers for systemd (245.4-4ubuntu3.1) ... Processing triggers for man-db (2.9.1-1) ... Processing triggers for libc-bin (2.31-0ubuntu9) ... Errors were encountered while processing: udev E: Sub-process /usr/bin/dpkg returned an error code (1) (clear the error and downgrade udev again, and add -proposed to apt sources) ubuntu@lp1880541-f:~$ dpkg -l udev|grep udev ii udev 245.4-4ubuntu3 amd64 /dev/ and hotplug management daemon ubuntu@lp1880541-f:~$ sudo groupadd kvm groupadd: group 'kvm' already exists ubuntu@lp1880541-f:~$ dpkg -l udev|grep udev ii udev 245.4-4ubuntu3 amd64 /dev/ and hotplug management daemon ubuntu@lp1880541-f:~$ grep kvm /etc/group kvm:x:108: ubuntu@lp1880541-f:~$ sudo groupdel kvm ubuntu@lp1880541-f:~$ grep kvm /etc/group ubuntu@lp1880541-f:~$ sudo groupadd kvm ubuntu@lp1880541-f:~$ grep kvm /etc/group kvm:x:1001: ubuntu@lp1880541-f:~$ sudo apt install udev Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: libudev1 The following packages will be upgraded: libudev1 udev 2 upgraded, 0 newly installed, 0 to remove and 46 not upgraded. Need to get 1442 kB of archives. After this operation, 4096 B of additional disk space will be used. Do you want to continue? [Y/n] y Get:1 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 udev amd64 245.4-4ubuntu3.2 [1363 kB] Get:2 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 libudev1 amd64 245.4-4ubuntu3.2 [78.9 kB] Fetched 1442 kB in 1s (1415 kB/s) (Reading database ... 66302 files and directories currently installed.) Preparing to unpack .../udev_245.4-4ubuntu3.2_amd64.deb ... Unpacking udev (245.4-4ubuntu3.2) over (245.4-4ubuntu3) ... Preparing to unpack .../libudev1_245.4-4ubuntu3.2_amd64.deb ... Unpacking libudev1:amd64 (245.4-4ubuntu3.2) over (245.4-4ubuntu3) ... Setting up libudev1:amd64 (245.4-4ubuntu3.2) ... Setting up udev (245.4-4ubuntu3.2) ... The group `kvm' already exists and is not a system group. Exiting. update-initramfs: deferring update (trigger activated) Processing triggers for systemd (245.4-4ubuntu3.1) ... Processing triggers for man-db (2.9.1-1) ... Processing triggers for libc-bin (2.31-0ubuntu9) ... Processing triggers for initramfs-tools (0.136ubuntu6.2) ... update-initramfs: Generating /boot/initrd.img-5.4.0-40-generic