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    The user is not "getting back" 8 GB. The are getting 8 GB more to spend. It would be better to track down what's using up all the disk space and then possibly do a cleanup of that, if appropriate, or otherwise move it elsewhere, or grow the partition. Commented Jun 29, 2019 at 12:16
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    @Kusalananda I'll change the vocabulary. As for the usage, I'd need OP's feedback. The question never hinted that there was unknown high usage, only missing 10GB. Commented Jun 29, 2019 at 12:19
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    A very good and helpful answer, thank you. 5% seems to match the missing 10 gigabytes very clearly. I am not worried about using so much disk space overall, and I can still grow my partition. :) Commented Jun 29, 2019 at 17:34
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    Your answer is certainly correct, but it may be worth noting that the value of root-reserved space in this case isn't huge. This is /home, and reserving space for root there isn't as important as it is for other parts of the file system (e.g. to ensure system logs can still be written). Also, as this is an SSD, preventing fragmentation may not have the priority it does on spinning metal disks. Commented Jun 29, 2019 at 21:46
  • @marcelm That makes sense to me. But is it still useful on a /home partition on an SSD or is it just a waste of space? Would you recommend lowering the root reserved space to 1%? Commented Jul 1, 2019 at 8:05