Public bug reported:

Binary package hint: coreutils

As I understand it, uniq -u and sort -u should both give the same set of
lines, albeit in different order.

The -u switch should mean "output unique lines only" on both utils.
However, when using uniq -u, I get dropped lines. I included a sample
log file which demonstrates this behaviour.

If you don't want to make a manual comparison of
$ sort -u uniq-test
and
$ uniq -u uniq-test
you can simply try
$ diff -u <(uniq -u uniq-test | sort) <(sort -u uniq-test)

which will reveal the difference.

I hope this bug gets looked into quickly, as it is such a fundamental
command line tool

** Affects: coreutils (Ubuntu)
     Importance: Undecided
         Status: New

-- 
uniq -u drops wrong lines
https://bugs.launchpad.net/bugs/299897
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