On 11/14/2017 12:58 PM, Ben Caradoc-Davies wrote:
On 15/11/17 04:48, Marc Shapiro wrote:
$ designer
designer: could not exec 
'/usr/lib/x86_64-linux-gnu/qt4/bin/designer': No such file or directory
$ assistant
assistant: could not exec 
'/usr/lib/x86_64-linux-gnu/qt4/bin/assistant': No such file or directory
qtchooser is defaulting to a version of qttools5-dev-tools that you do 
not have. You should be able to change this by setting QT_SELECT or by 
editing/symlinking the qtchooser configuration file 
/usr/lib/x86_64-linux-gnu/qt-default/qtchooser/default.conf . "man 
qtchooser" for details.
Thanks!  That did it.  Ijust changed the first line in the config file 
from:
     /usr/lib/x86_64-linux-gnu/qt4/bin
to:
     /usr/lib/x86_64-linux-gnu/qt5/bin
All is good, now.