Improving the reliability of file system monitoring tools (Collabora blog)

I never made / read-only, but I did make /usr read-only, in the old days hard drives were small, and all of /, /usr, /var, /usr/local, /export/home1, /export/home2 (/home on autofs), ... were put on separate partitions. And after a while a bunch more, when you ran out of space.

Hence before and after doing "apt-get upgrade", I had to remount /usr read-write resp. read-only.

P.S. I'm not that old, as I'm mentioning /var ;-)