[问题]can't use apt-get ? why

[meladet]

soledad@soledad-laptop:~$ sudo apt-get update
E: 无法获得锁 /var/lib/apt/lists/lock - open (11 Resource temporarily unavailable)
E: 无法对状态列表目录加锁
soledad@soledad-laptop:~$
the soures.list :
deb http://ubuntu.cn99.com/ubuntu/ edgy main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ edgy-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ dedgy-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ edgy-backports main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu-cn/ edgy main restricted universe multiverse

but still can't use apt-get ,help me!

[dorice]

你是不是同时打开了新立得？