Linux 常见问题

1 Could not open lock file /var/lib/dpkg/lock-frontend - open (2: No such file or directory)
 

# lsof /var/lib/dpkg/lock-frontend
# sudo kill -9 PID   
 

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

sudo rm -rf /var/cache/apt/archives/lock

sudo apt-get update

sudo dpkg --configure -a

2 The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32

 

3E: flAbsPath on /var/lib/dpkg/status failed - realpath (2: No such file or directory) 

sudo mkdir -p /var/lib/dpkg/{alternatives,info,parts,triggers,updates}
sudo cp /var/backups/dpkg.status.0 /var/lib/dpkg/status
apt-get download dpkg
sudo dpkg -i dpkg*.deb
apt-get download base-files
sudo dpkg -i base-files*.deb
sudo apt-get update
sudo apt-get check
 

NFS

mount -t nfs -o nolock,vers=3 192.168.5.11:/home/book/nfs_rootfs /mnt 

USB_WIFI

ifconfig wlan0 up

sudo su                 
 
mv /var/lib/dpkg/info     /var/lib/dpkg/info_bak
 
mkdir /var/lib/dpkg/info
 
apt-get update && apt-get -f install 
 
mv /var/lib/dpkg/info/*        /var/lib/dpkg/info_bak/
 
rm -rf /var/lib/dpkg/info
 
mv /var/lib/dpkg/info_bak /var/lib/dpkg/info

在NFS服务器端(RHEL6.5)使用命令 showmount -e 127.0.0.1 报错，提示：clnt_create: RPC: Program not registered

/etc/init.d/nfs-kerner-server restart   #(status)

/etc/init.d/rpcbind restart 

（reboot)

验证

showmount -e
Export list for ubuntu:
/home/t/nfs_rootfs *

系统挂载信息

cat /proc/mount