E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarly unavailable)

在Ubuntu install某个东西时,给出下面提示

E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarly unavailable)

E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is an other process using it?

在大部分情况下,问题的原因在于其它的程序如系统的自动更新等正在使用apt-get进程,被锁定了,所以解决方法也就是将这一进程关闭,最简单的方法就是直接删除锁定文件。

sudo rm -rf /var/lib/dpkg/lock-frontend       
sudo rm -rf /var/lib/dpkg/lock

OpenWRT路由器OpenConnect VPN防火墙设置

OpenWRT - 网络 - 防火墙 - 自定义规则
添加以下三条记录,允许客户端使用路由器转发流量,重启防火墙生效.

iptables -t nat -I POSTROUTING -s 192.168.100.0/24 -j MASQUERADE
iptables -I FORWARD -i vpns+ -s 192.168.100.0/24 -j ACCEPT
iptables -I INPUT -i vpns+ -s 192.168.100.0/24 -j ACCEPT

Ubuntu18.04 Server版 修改网络配置

1.查看网卡名称

ip add查看网卡名称,不同版本系统,网卡名称可能不一样

zz@ubuntu:~$ ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:2d:fa:86 brd ff:ff:ff:ff:ff:ff
    inet 10.1.1.243/24 brd 10.1.1.255 scope global dynamic ens3
       valid_lft 43139sec preferred_lft 43139sec
    inet6 fe80::5054:ff:fe2d:fa86/64 scope link 
       valid_lft forever preferred_lft forever