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Don't. You might be able to get it to work if you install from source, but you'll most likely run into issues. This is because ROS distros target a specific Ubuntu version (or sometimes 2 versions). If you use a different Ubuntu version, most dependencies will have different versions as well and this will most likely lead to annoying issues.
For Ubuntu 18.04, you're better off running ROS Melodic.
If you still want to use ROS Indigo, install & run it inside a Ubuntu 14.04 Docker container on your Ubuntu 18.04 machine.
Asked: 2021-06-16 13:34:46 -0500
Seen: 645 times
Last updated: Jun 17 '21
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maybe from source ? http://wiki.ros.org/Installation/Source
@deepsphere: could you clarify why you ask how to install Indigo on
18.04?It's not a really good idea in any case, but perhaps if you could clarify why you're looking to do that, we can suggest alternative strategies.
Not trying to dig on you personally but I started my week trying to address this very common problem.