William Morder wrote:

> I don't choose to put anything there. When I install, the package manager
> installs these items in that folder. (Seamonkey used to be installed like
> other packages, but now it is separately maintained on SourceForge; and
> now it gets installed in /opt. Likewise OpenOffice, now that Apache
> maintains it separately, is installed there.)

I was thinking a while if I should answer this - I mean, start looking for
answer yourself as I don't feel to be a babysitter or put questions forward
if you search for an answer for lets say 30 minutes and can not find any
usable.
Of course everybody is free to ask or answer ... but I think you are asking
too much without listening and this is the motivation to write this,
because I told you to remove all that was not custom installed from /opt,
but you talk too much and listen too little. This is pure chaos.
Ask a definite question, complete the task and close the topic, after this
open new topic.

From the length of the discussion I can conclude that the question was vague
and it went off topic too much.
Just close this question with "my vanishing root partition" and open another
on how to proceed with /opt on new install

regards