I have some problem while installing pcmanx?

ubuntu@ubuntu:~$ sudo apt-get update;apt-get install pcmanx-gtk2
略過 http://apt.debian.org.tw testing Release.gpg
略過 http://apt.debian.org.tw testing Release
略過 http://apt.debian.org.tw testing/main Packages
略過 http://apt.debian.org.tw testing/main Sources
已有 http://apt.debian.org.tw testing/main Packages
已有 http://apt.debian.org.tw testing/main Sources
下載:1 http://security.ubuntu.com breezy-security Release.gpg [189B]
已有 http://security.ubuntu.com breezy-security Release
已有 http://security.ubuntu.com breezy-security/main Packages
已有 http://security.ubuntu.com breezy-security/restricted Packages
已有 http://security.ubuntu.com breezy-security/main Sources
已有 http://security.ubuntu.com breezy-security/restricted Sources
讀取 1B 用了 17s (0B/s)
讀取套件清單中... 完成
E: 無法開啟『/var/lib/apt/lists/lock』鎖定檔。 - open (13 拒絕不符權限的操作)
E: 無法鎖定列表目錄
ubuntu@ubuntu:~$

你少用一個 sudo

apt-get install pcmanx-gtk2 沒有吃到 sudo 的關係

sudo apt-get install pcmanx-gtk2 應該就可以哩：)

直接用synaptic搜尋pcmanx就可以了