I have a SSD and a HDD on my system. I want to install Ubuntu on the SSD (dual boot with win10) and keep all other files, programs etc. on the HDD? How much disk space I need on the SSD and how can I achieve this?
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4Possible duplicate of How to use manual partitioning during installation? and How do I find out which version and derivative of Ubuntu is right for my hardware in terms of minimal system requirements? – karel Mar 31 '18 at 15:28
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The official "minimum" space requirements for Ubuntu 16.04 LTS & Ubuntu 17.10 show 25GB of free hard drive space. You probably will want to add some cushion to that so that you don't run into trouble with your SSD -- especially since both Ubuntu and Win10 will increase in size.
Assuming you have 25GB free on the SSD plus some cushion (I'd recommend ~40GB+ free space on the SSD before moving forward), then when you boot to an Ubuntu Live USB stick and step through the installation process, you'll have the opportunity to make choices about where everything gets installed and how.

TheDavidJohnson
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Thanks for the information but maybe I couldn't express myself clearly. Can I add 'cushions' to my HDD and run Ubuntu with 25GB on the SSD for faster boots? Since my SDD is 128 GB I can not have a 40+ GB partition – Raven Mar 31 '18 at 13:20
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You will probably want more than 25GB of free space on the SSD to install and run Ubuntu there for fast booting of a "typical" desktop installation of Ubuntu. If you'd like to avoid having to set up a partition as large as the one I recommended, you can refer to the article linked in a previous comment by @karel to see if a different Ubuntu configuration makes sense. Of course you can try a 25GB partition at first if that's all you have. It should work for a while. – TheDavidJohnson Apr 02 '18 at 12:49