Linux (and probably most Unix systems) use a 32 bit time counter so didn't have the Y2K issue. But there might have been some applications that had it. And its

Linux (and probably most Unix systems) use a 32 bit time counter so didn't have the Y2K issue. But there might have been some applications that had it. And its possible some early bios clocks used 2 digit year that had to be worked around.