Because I messed around with trying to get things to work, my
/etc/network/interfaces doesn't even list my wireless connection. It just
shows the "auto lo" and "iface lo inet loopback" lines. It used to show more,
but when the Network Manager freaked out and wouldn't connect me anymore, I
cleared everything except those two lines. The Network Manager found my
wireless signal again and connected, and it works, but my interfaces file
never changed.
I will take the steps you suggested and see if that allows me to bridge.
For the errors, they are instead the virtual machines. Sometimes they come up
and won't let the virtual machine boot, just like if you went to boot your
physical computer and errors showed up instead. Sometimes they don't, and
things boot normally. No idea why it only happens sometimes and not other
times.
I've attached information from sysinfo, which hopefully has all the
information you asked about.
