This is not a bug.
In man uniq, you can read:
Note: ’uniq’ does not detect repeated lines unless they are adjacent.
You may want to sort the input first, or use ‘sort -u’ without ‘uniq’.
And when you use uniq -u, it removes lines that are *adjacent* AND
*equal* (if course here "equal" means non-unique).
Also note the "successive identical lines" in the uniq description:
Discard all but one of successive identical lines from INPUT (or
standard input), writing to OUTPUT (or standard output).
** Changed in: coreutils (Ubuntu)
Status: New => Invalid
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uniq -u drops wrong lines
https://bugs.launchpad.net/bugs/299897
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