Ok further test and information:
I’m more and more confused
What have I done:
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reflashed
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made a screenshot of system settings partion information
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installed Space inspector and Filemanager
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Copied via ssh a Video to /home/defaultuser/Videos and downloaded a large file from internet (ubuntu server) to /home/defaultuser/Downloads
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checked partiton information in system settings (while copying). Obervation here: space on home partition is descreasing, just like one would expect. BUT space on root is decreasing as well and in same dimension . Result is this:
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Space inspector shows this, when I analyse /
If I delete the files i copied to home, space on home is increasing again. On root it stays like before.
…and now? I’m absolutely clueless.