我正在尝试将youtube-dl视频从 youtube 下载到目录，但会弹出此错误：
$ youtube-dl -o ~/Videos http://www.youtube.com/watch?v=P0YiWsAM0O8
[youtube] P0YiWsAM0O8: Downloading webpage
[youtube] P0YiWsAM0O8: Downloading video info webpage
[youtube] P0YiWsAM0O8: Extracting video information
[youtube] P0YiWsAM0O8: Downloading MPD manifest
WARNING: Your copy of avconv is outdated and unable to properly mux separate video and audio files, youtube-dl will download single file media. Update avconv to version 10-0 or newer to fix this.
ERROR: unable to open for writing: [Errno 21] Is a directory: '/home/sami/Videos
我正在运行 Ubuntu 14.04 和youtube-dl …
我试图安装一些参考本文档的软件包：http : //wiki.friendlyarm.com/wiki/index.php/NanoPi_M1#Make_Your_Own_Debian
代码：
sudo apt-get install libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-glx:i386<br/>
前两行安装成功
当我尝试运行第三行时，结果是这样的：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies.
libgl1-mesa-glx:i386 : …