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Ubuntu System Info Commands

Disk Space & Usage
df -h
Task Manager
htop
Memory & Usage
free -m
System Stats shown at Login
/usr/bin/landscape-sysinfo
Network Adaptor States
networkctl
Network Devices and IP Addresses
ip addr show
ip route
Resolve DNS Info
cat /run/systemd/resolve/resolv.conf
List Failed Services
systemctl list-units --state=failed
List Active Service Live Data
sudo journalctl -f -u [service-name]