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I would like to know what to be careful about using Ubuntu for commercial use.
I use Ubuntu MATE (Ubuntu 16.04.2 LTS), some packages, and applications I created. I only use my applicaton on my own system.
I think that if I install a package whose license is GPL and I use for my application, then I have to publish my source code of my application openly.
Do I have to publish openly in the case where I do not use a package but it is installed default in the distribution (Ubuntu MATE)?
You only have to make the source code available if you distribute your software. For example: offering it for download, sending it per email, selling it on CDs, installing it somewhere else.
This is the case for all FLOSS licenses (but some differ in what counts as distribution if servers are involved).
Whether or not this happens in a commercial context isn’t relevant. FLOSS licenses don’t differentiate between commercial and non-commerical.
