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Try to allow DNS :

sudo ufw allow dns

For your ping command ICMP rules is also require you can read here.

# ok icmp codes
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT

For error Failed to fetch http://... you need to allow http traffic for port 80.

sudo ufw allow 80/tcp

Try to allow DNS :

sudo ufw allow out 53

For your ping command ICMP rules is also require you can read here.

# allow outbound icmp
-A ufw-before-output -p icmp -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
-A ufw-before-output -p icmp -m state --state ESTABLISHED,RELATED -j ACCEPT

For error Failed to fetch http://... you need to allow http traffic for port 80.

sudo ufw allow out 80

After editing the file, run the command:

sudo ufw reload

Try to allow DNS :

sudo ufw allow dns

For your ping command ICMP rules is also require you can read here.

For error Failed to fetch http://... you need to allow http traffic for port 80.

Try to allow DNS :

sudo ufw allow dns

For your ping command ICMP rules is also require you can read here.

# ok icmp codes
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT

For error Failed to fetch http://... you need to allow http traffic for port 80.

sudo ufw allow 80/tcp

Try to allow DNS :

sudo ufw allow dns

Try to allow DNS :

sudo ufw allow dns

For your ping command ICMP rules is also require you can read here.

For error Failed to fetch http://... you need to allow http traffic for port 80.