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One month ago I dual booted and gave my root partition around 25GB following guidelines such as this one (there were more), setting a bigger space aside for my home partition. I now tried to install matlab with all its complements in the suggested directory in /usr/local but run out of space. I looked online and matlab with the whole complements takes about 20GB so that may make sense.

What did I do wrong?

  1. Should have put more space for the root partition, guidelines were wrong
  2. The recommended size made sense, Matlab+all packages is just unexpectedly big.
  3. I should not install some programs in /usr/local, but somewhere else.
  4. Something else

In any case, what's the best way to proceed? I currently have installed matlab+complements in home, where I have plenty of space (but in Hard Disk, not SSD).

  • I'd say #1 and #2. – heynnema Dec 17 '16 at 15:14
  • Aren't #1 and #2 contradictory? Either the guidelines were right (#2) or they were not (#1) – etal Dec 17 '16 at 15:32
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    ok... then "Should have put more space for the root partition" AND "Matlab+all packages is just unexpectedly big". – heynnema Dec 17 '16 at 15:35
  • I just create one big btrfs partition and subdivide it using subvolumes that can be mounted or backed up separately. In this case all free space is shared. – Andrius Štikonas Dec 18 '16 at 14:10
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I say the recommended size still makes sense, though I tend to use bigger partition sizes because we have so much space available nowadays, even on SSD. Currently, I have a 45 GiB root on one machine, and 60 GiB on another machine.

Even though I use bigger partitions, in practical use, with a comfortable selection of software, I use much less than 25 GiB: about 6 GiB for the software, and a couple of GiB in /var. The rest is in separate partitions (/home and data).

So 25 GiB is not an incorrect advice. I would only worry about modern games (which tend to use GiB like it's free). And now that I've read your question, Matlab too.

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