Linux Debian 10, kommandon hittas inte med nytt AMD Ryzen system

login as: david
david@192.168.1.2's password:
Linux Debian 4.19.0-13-amd64 #1 SMP Debian 4.19.160-2 (2020-11-28) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Wed Dec 30 23:13:43 2020
david@Debian:~$ su
Password:
root@Debian:/home/david# apt-get update && apt-get upgrade
Hit:1 http://security.debian.org/debian-security buster/updates InRelease
Hit:2 http://deb.debian.org/debian buster InRelease
Hit:3 http://deb.debian.org/debian buster-updates InRelease
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@Debian:/home/david# useradd guest
bash: useradd: command not found
root@Debian:/home/david# useradd
bash: useradd: command not found
root@Debian:/home/david# groupadd share
bash: groupadd: command not found
root@Debian:/home/david# groupadd
bash: groupadd: command not found
root@Debian:/home/david# adduser guest
bash: adduser: command not found
root@Debian:/home/david# adduser
bash: adduser: command not found
root@Debian:/home/david# blkid
bash: blkid: command not found
root@Debian:/home/david#

# Update
apt-get update && apt-get upgrade

# Openssh
apt-get install openssh-client
apt-get install openssh-server

# User and group
useradd guest
passwd guest
groupadd share
usermod -a -G share david

# Mount points
mkdir /Disk#0

# Parted
parted /dev/sd*
mklabel gpt
mkpart primary 0% 100%
align-check
optimal
print
quit
mkfs.ext4 /dev/sd*1
blkid

# Mount HDD
fdisk -l
vi /etc/fstab
# Add lines fstab.txt

# Deafault public owner:root group:share
setfacl -d -m u:root:rwx /Disk#0
setfacl -d -m g:share:rwx /Disk#0
setfacl -d -m o::r-x /Disk#0

# Change public owner and permission recursive
chown -R root:share /Disk#0
chmod -R 0775 /Disk#0

# Default private owner:david group:david
setfacl -dm u:david:rwx /Disk#1
setfacl -dm g:david:rwx /Disk#1

# Change private owner and permission recursive
chown -R david:david /Disk#1
chmod -R 0770 /Disk#1

#Midnight Commander
apt-get install mc
mc

# Samba
apt-get install samba
smbpasswd -a david
smbpasswd -a guest
vi /etc/samba/smb.conf
# Add lines smb.conf.txt
/etc/init.d/samba restart

david@Debian:~$ grep
Usage: grep [OPTION]... PATTERNS [FILE]...
Try 'grep --help' for more information.
david@Debian:~$ grep --help
Usage: grep [OPTION]... PATTERNS [FILE]...
Search for PATTERNS in each FILE.
Example: grep -i 'hello world' menu.h main.c
PATTERNS can contain multiple patterns separated by newlines.

Pattern selection and interpretation:
...
[Wall of Text]
...
Report bugs to: bug-grep@gnu.org
GNU grep home page: <http://www.gnu.org/software/grep/>
General help using GNU software: <https://www.gnu.org/gethelp/>
david@Debian:~$ whoami
david
david@Debian:~$ su
Password:
root@Debian:/home/david# whoami
root
root@Debian:/home/david#

david@Debian:~$ ls -l /usr/sbin/david
ls: cannot access '/usr/sbin/david': No such file or directory
david@Debian:~$ su -
Password:
root@Debian:~# ls -l /usr/sbin/david
ls: cannot access '/usr/sbin/david': No such file or directory

david@Debian:~$ ls -l /usr/sbin/*user*
-rwxr-xr-x 1 root root  34518 Sep 15  2018 /usr/sbin/adduser
-rwxr-xr-x 1 root root  15782 Sep 15  2018 /usr/sbin/deluser
-rwxr-xr-x 1 root root  88464 Jul 27  2018 /usr/sbin/newusers
-rwxr-xr-x 1 root root  63568 Jan 10  2019 /usr/sbin/runuser
-rwxr-xr-x 1 root root 130304 Jul 27  2018 /usr/sbin/useradd
-rwxr-xr-x 1 root root  92624 Jul 27  2018 /usr/sbin/userdel
-rwxr-xr-x 1 root root 126016 Jul 27  2018 /usr/sbin/usermod