The problem has been identified:
the file "/etc/hosts" had been corrupted during a prior update -- there should
be a line of the form:
127.0.1.1 {machine-name}.{domain-name} {machine-name}
,,,but mine had lost the second instance of "{machine-name}", causing it
to "lock-up". by reinserting it (using the command "gksudo gedit
/etc/hosts"), Update Manager happily downloaded and installed a large
number of updates.
Perhaps the code that references this line of /etc/hosts could verify
that it is in the correct form, and issue a warning diagnostic if not?
--
Update-manager locks up when "Check" is clicked
https://bugs.launchpad.net/bugs/232082
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