Буду краток.
root@a20:/etc# fdisk -l
bash: fdisk: command not found
root@a20:/etc# apt install fdisk
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
fdisk is already the newest version (2.36.1-8+deb11u1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@a20:/etc# which fdisk
root@a20:/etc# uname -a
Linux a20 5.10.0-12-amd64 #1 SMP Debian 5.10.103-1 (2022-03-07) x86_64 GNU/Linux
root@a20:/etc# cat /etc/issue
Debian GNU/Linux 11 \n \l
root@a20:/etc#
Ну почему оно не может просто взять и работать ?