William Morder composed on 2018-03-19 09:31 (UTC-0700):
...
> 13G     total
> - where I find that /usr/lib and /usr/share take up the most. I don't think 
> you really want to read the whole list for these folders. Thus here are the 
> items that take up the most space. Most look pretty innocuous: 
> 1.6G    /usr/lib/i386-linux-gnu
> but in /usr/lib at the end I get 
> 5.3G     total
> - but nothing else is more than a few kb or mb. The same thing happens when I 
> look in /usr/share; the biggest item is: 
> 1.9G    /usr/share/doc
> - and nothing else takes up more than a few kb or mb, yet at the end I get: 
> 6.1G     total

1-Have you ever manually added content to, or removed content from, /usr/ (other
than /usr/local/), including with a backup/restore program (not package any
manager)?

2-Is your / filesystem type BTRFS?

3-How many installed kernels and initrds do you have?

4-Do you have many optional font packages installed?

5-Asking on debian-user list may draw a more helpful response.

If answer to 1 is yes, suspect possible broken hard links.

Even though we both use 18G / filesystems, mine has only 444M in /usr/lib/ and
1.3G in /usr/share/. I have 5 installed kernels, and EXT4 /.
# df /
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/md2        18011336 7691316   9382044  46% /
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