The names of files in
/etc/sources.list.d must end in
.list, if they are to be included as software sources.
As the man page of sources.list says:
The package resource list is used to locate archives of the package
distribution system in use on the system. At this time, this manual
page documents only the packaging system used by the Debian GNU/Linux
system. This control file is /etc/apt/sources.list.
The source list is designed to support any number of active sources and
a variety of source media. The file lists one source per line, with the
most preferred source listed first. The format of each line is: type
uri args The first item, type determines the format for args. uri is a
Universal Resource Identifier (URI), which is a superset of the more
specific and well-known Universal Resource Locator, or URL. The rest of
the line can be marked as a comment by using a #.
The /etc/apt/sources.list.d directory provides a way to add
sources.list entries in separate files. The format is the same as for
the regular sources.list file. File names need to end with .list and
may only contain letters (a-z and A-Z), digits (0-9), underscore (_),
hyphen (-) and period (.) characters. Otherwise APT will print a notice
that it has ignored a file if the file doesn't match a pattern in the
Dir::Ignore-Files-Silently configuration list - in this case it will be
Taking an example from this page, suppose you wanted to install chef (from opscode), what you'd do is:
- Create and open a file named
sudo vim /etc/apt/sources.list.d/opscode.list
- Add the required line and save the file:
deb http://apt.opscode.com/ oneiric main
The above steps can be combined to make a single command:
sudo /bin/sh -c 'echo "deb http://apt.opscode.com/ onereic main" > /etc/apt/sources.list.d/opscode.list'
Note: The command contains
onereic because the codename of the Ubuntu you're using is Onereic. Had you been using Precise (12.04), you'd have writter