Ubuntu: Why am I getting “Command 'deb' not found”?


I have come across several installation instructions that include the command deb. But it appears that this command is not available on my installation.

Where can I get this command? Is there a work-around?


'deb' is not a command. It is used in sources.list file to indicate a Debian software repository.

From Ubuntu Manpage - 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 deb type describes a typical two-level Debian archive, distribution/component. The format for a sources.list entry using the deb and deb-src types is:

deb [ options ] uri distribution [component1] [component2] [...]  

The URI for the deb type must specify the base of the Debian distribution, from which APT will find the information it needs. distribution can specify an exact path, in which case the components must be omitted and distribution must end with a slash (/). This is useful for when the case only a particular sub-section of the archive denoted by the URI is of interest. If distribution does not specify an exact path, at least one component must be present.

So, if I have deb http://archive.ubuntu.com/ubuntu/ quantal main restricted in sources.list it says I have a Debian archive which is based on "http://archive.ubuntu.com/ubuntu/", the distribution is "quantal" and the components are "main" and "restricted".


like answer by @Eric Carvalho deb is not command line If you have deb then url like this:

deb http://download.virtualbox.org/virtualbox/debian trusty contrib   


like commit of @muru, you need to create new file with extension .list into /etc/apt/source.list.d/ folder:

Example: I want to download Oracle virtualbox, create new file :

sudo gedit /etc/apt/sources.list.d/oracle-virtualbox-trusty.list   

Then copy and past the line of deb into this file


deb is not a unix command. If you have a line like the following (source for docker):

deb https://apt.dockerproject.org/repo ubuntu-xenial main  

it is a line that must be available in your ubuntu sources.list so that apt-get can find future packages from this new source.

However, it's not a good practice to edit the /etc/apt/sources.list file directly. Instead add the deb line as an entry to a new .list file inside the /etc/apt/sources.list.d/ directory. We will create a docker.list file like this:

echo "deb https://apt.dockerproject.org/repo ubuntu-xenial main" | sudo tee /etc/apt/sources.list.d/docker.list  

Once done, remember to perform a sudo apt-get update and you should now be able to find new packages from this source easily.


Deb isn't actually a command (I thought so too, at first) -- Assuming you are trying to download/install a deb, do this (for example):

wget http://whatever.com/whatever.deb

then dpkg -i whatever.deb

then run the commands:

sudo apt-get update  

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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