Installer fails with SIGABRT on ubuntu 16.04

Have tried multiple times over past week to install Qt on ubuntu 16.04 LTS desktop.  No success.   Installation begins ok, generally gets somewhere between 30-45% finished, then aborts, apparently with SIGABRT.  Have tried this with

qt-unified-linux-x64-3.0.2-online.run
qt-opensource-linux-x64-5.10.1.run
qt-opensource-linux-x64-5.7.0

All of these fail with more or less same symptoms:  

[72035] Fatal: Exception thrown: std::exception
Exception thrown: std::exception

Used gdb to examine core dump:

GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
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Type "show configuration" for configuration details.
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[New LWP 9524]
[New LWP 9526]
[New LWP 9527]
[New LWP 9525]
[New LWP 9959]
[New LWP 9958]
[New LWP 9529]
[New LWP 9528]
Core was generated by `./qt-opensource-linux-x64-5.10.1.run'.
Program terminated with signal SIGABRT, Aborted.
#0 0x00007f0e3f7c8428 in ?? ()
[Current thread is 1 (LWP 9524)]
(gdb) where
#0 0x00007f0e3f7c8428 in ?? ()
#1 0x00007f0e3f7ca02a in ?? ()
#2 0x0000000000000020 in ?? ()
#3 0x0000000000000000 in ?? ()

That's about as far as I can get w/out source or any sort of map.