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Indigo is not available for 16.04 (I tried myself too). Notice the following line in the installation tutorial:

Setup your computer to accept software from packages.ros.org. ROS Indigo ONLY supports Saucy (13.10) and Trusty (14.04) for debian packages.

That means indigo can not be found in the package source that we previously added to our list. Note the "$(lsb_release -sc)" when we add it to the source list. This allows it to only look for ros versions compatible with the linux release info.

There may be a way to install Indigo on 16.04 but I am not aware of it and it is not officially supported so you may run into issues down the line. If you absolutely need Indigo, I would suggest installing 14.04. Or, if you absolutely need 16.04, there is supposed to be a new ROS release this month. Actually, maybe it's already available, check here for installation.

Indigo is not available for 16.04 (I tried myself too). last week too :D). Notice the following line in the installation tutorial:

Setup your computer to accept software from packages.ros.org. ROS Indigo ONLY supports Saucy (13.10) and Trusty (14.04) for debian packages.

That means indigo can not be found in the package source that we previously added to our list. Note the "$(lsb_release -sc)" when we add it to the source list. This allows it to only look for ros versions compatible with the linux release info.

There may be a way to install Indigo on 16.04 but I am not aware of it and it is not officially supported so you may run into issues down the line. If you absolutely need Indigo, I would suggest installing 14.04. Or, if you absolutely need 16.04, there is supposed to be a new ROS release this month. Actually, maybe it's already available, check here for installation.