我想安装Numix图标主题，因此我需要添加ppa，但它奇怪地引发了这个错误：
Traceback (most recent call last):
File "/usr/bin/add-apt-repository", line 163, in <module>
if not sp.add_source_from_shortcut(shortcut, options.enable_source):
File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 750, in add_source_from_shortcut
self.set_modified_sourceslist()
File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 484, in set_modified_sourceslist
self.save_sourceslist()
File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 650, in save_sourceslist
self.sourceslist.save()
File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 415, in save
files[source.file] = open(source.file, "w")
FileNotFoundError: [Errno 2] Böyle bir dosya ya da dizin yok: '/etc/apt/sources.list.d/numix-ppa-trusty.list'
从代码中，我了解到Python想要打开一个配置文件，但由于它找不到它，所以它也无法创建它。 （管他呢...）
这个错误的根源是什么？怎么处理呢？还有，Linux 是否使用 Python 来执行存储库命令（因为这更有趣）？
我运行了这些代码：
sudo apt-add-repository ppa:numix/ppa
sudo apt-get update
sudo apt-get install numix-icon-theme numix-icon-theme-circle
操作系统：Xubuntu 14.04 LTS
编辑：编辑sources.list
每当我运行这段代码时，我都会遇到https://launchpad.net/~numix/+archive/ubuntu/ppa关联。所以我在sources.list中尝试了这些：
###############################################
# Number One: Add The Link To The End Of File #
###############################################
deb https://launchpad.net/~numix/+archive/ubuntu/ppa trusty partner
deb-src deb https://launchpad.net/~numix/+archive/ubuntu/ppa trusty partner
# I used "deb", "deb-src" and "trusty partner" patterns to achieve my goal, but it failed.
###################################
# Number Two: Change Link Pattern #
###################################
deb https://launchpad.net/~numix/+archive/ubuntu trusty partner
deb-src deb https://launchpad.net/~numix/+archive/ubuntu trusty partner
# I also tried those since other repository links ends with "ubuntu" instead of "ppa" but this also failed.
答案1
您的系统似乎/etc/apt/sources.list.d缺少该目录（您可以使用 确认这一点ls /etc/apt/sources.list.d，它应该显示“没有这样的文件或目录”）。如果确实如此，请使用以下命令重新创建它
sudo mkdir /etc/apt/sources.list.d
然后再试一次。