There is no "Unity add printer dialog". Where exactly did you click on "Add printer"?
I assume that you are using system-config-printer, the default printer setup tool. To get more debug information, open a terminal window and run the command
system-config-printer --debug 2>&1 | tee log.txt
go the steps until getting the frozen dialog, the press Ctrl+C in the terminal window (or run "xkill" in a new tab of the terminal window and click the frozen dialog). After that attach log.txt to this bug report.
There is no "Unity add printer dialog". Where exactly did you click on "Add printer"?
I assume that you are using system- config- printer, the default printer setup tool. To get more debug information, open a terminal window and run the command
system- config- printer --debug 2>&1 | tee log.txt
go the steps until getting the frozen dialog, the press Ctrl+C in the terminal window (or run "xkill" in a new tab of the terminal window and click the frozen dialog). After that attach log.txt to this bug report.