Well, be obviously fail here on the "promptly" part.
No, not having web access because of the installation is not a security
vulnerability. What would allow one to gain full access to that machine
would be considered a security vulnerability (or any other such
"malicious access", "denial of service", etc.)
There's sadly not enough information here to be able to properly
diagnose the issue. The ideal way to know what happened would be to have
a packet capture of the traffic as coming in and out of the Ubuntu
system, and possibly a similar packet capture for the same timeframe
from another system. It might also be helpful to add the file
/var/log/syslog from the Ubuntu machine.
** Changed in: network-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/299942
Title:
Network-Manager wouldn't hold subnet, further disrupted entire network
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