已安装建议的库来播放加密 DVD，但仍然没有播放。当我输入
sudo apt-get install ubuntu-restricted-extras
sudo /usr/share/doc/libdvdread4/install-css.sh
以下回复
Reading package lists... Done
Building dependency tree
Reading state information... Done
ubuntu-restricted-extras is already the newest version.
The following packages were automatically installed and are no longer required:
sbsigntool libnumber-compare-perl linux-image-3.11.0-18-generic execstack
gir1.2-timezonemap-1.0 libipc-run-perl realpath efibootmgr libnet-ip-perl
squashfs-tools libnet-dns-perl moreutils libdmraid1.0.0.rc16
libdebconfclient0 libdate-calc-xs-perl kpartx-boot libfile-find-rule-perl
linux-headers-3.11.0-18-generic libio-pty-perl libwayland-ltss-server0
linux-generic-lts-saucy user-setup kpartx libelfg0 python-webkit rdate
linux-headers-3.11.0-18 acpidump libdebian-installer4 read-edid
libxrandr-ltss2 btrfs-tools liblzo2-2 libdate-calc-perl apt-clone
localechooser-data libcarp-clan-perl libtext-glob-perl iasl dh-modaliases
python-dmidecode archdetect-deb libwayland-ltss-client0 dmraid python-pyicu
cpuid libdigest-hmac-perl libbit-vector-perl pnputils libllvm3.3
Use 'apt-get autoremove' to remove them.
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
我尝试删除并获取
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?
我该如何回复这个问题，我是否应该删除这些文件（即它们是否会阻止 DVD 工作？）
答案1
如果你是 root 用户，当另一个进程打开该文件时可能会发生权限错误。你可以使用以下命令进行检查定影器例如
sudo fuser -a /var/lib/dpkg/lock