fixing infinite apt-get install timeout on raspberry pi

For some reason the IP6 address of the archive causes connection problems and infinite timeouts connecting. The solution is to force IP4, which you can make permanent.
 
Two methods. 1st method is best because it also fixes wget

sudo nano /etc/sysctl.conf
append the following lines to turn off ipv6:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
run sudo sysctl -p to take effect or just reboot.

2nd method, apt-get only

echo 'Acquire::ForceIPv4 "true";' | sudo tee /etc/apt/apt.conf.d/99force-ipv4

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