After some more testing, I found that there was some cruft in my persistent live system. I wiped the casper-rw partitions's upper directory except the home subdirectory, and things started to work again in Lubuntu daily :-)
The cruft must be leftover from previous daily editions of Xenial. Sorry for spamming Launchpad with this bug report.
After some more testing, I found that there was some cruft in my persistent live system. I wiped the casper-rw partitions's upper directory except the home subdirectory, and things started to work again in Lubuntu daily :-)
The cruft must be leftover from previous daily editions of Xenial. Sorry for spamming Launchpad with this bug report.