Ubuntu Linux commands
Mostly for my own benefit
Make Add-Apt-repository available:
apt-get install software-properties-common
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Change Hostname:
sudo nano /etc/hostname
sudo nano /etc/hosts
Turn off IPv6
sudo nano /etc/sysctl.conf
Add:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
save
sudo reboot
Bring an interface up/down new method:
ip link set dev up
ip link set dev down