> ... rebooted, reinstalled libreoffice, and now > it seems to launch. Mind, when I launch it from the command line, I > still get the "Warning: failed to launch javaldx - java may not > function correctly" error, but nothing related to the `libc` error. So > at least that narrows it down.
That is warning you that you have to install the libreoffice-java package, needed for some functions that require it. Until you hit one of those, you can ignore the warning.