Troubleshooting the problem that ubuntu cannot access the Internet

After adding a bridge network, ubuntu can't access the Internet and
then delete it, but still can't access the Internet, ping can't get through the gateway
Troubleshooting process

uname -a
lspci -knn
sudo lshw -C net
sudo ifconfig -a
sudo iwconfig
sudo cat /etc/resolv.conf
sudo route -nv
sudo nmcli dev show

sudo apt-get install pastebinit
cd
wget -O wireless-info http://git.oschina.net/pastebin/wireless-info/raw/master/wireless-info
bash wireless-info
sudo cat /var/log/syslog | pastebinit