Wont run properly

I installed, and start gdbgui:

> gdbgui -v
0.15.0.1

> gdbgui a.out
Opening gdbgui with default browser at http://127.0.0.1:5000
View gdbgui dashboard at http://127.0.0.1:5000/dashboard
exit gdbgui by pressing CTRL+C
This tool has been deprecated, use 'gio open' instead.
See 'gio help open' for more info.

In the GUI I see:

gdbgui output (read-only)
Copy/Paste available in all terminals with ctrl+shift+c, ctrl+shift+v
Started new gdb process, pid 3516
No gdb response received after 10 seconds.
Possible reasons include:
1) gdbgui, gdb, or the debugged process is not running.
2) gdb or the inferior process is busy running and needs to be interrupted (press the pause button up top).
3) Something is just takin

g a long time to finish and respond back to this browser window, in which case you can just keep waiting.

And:

running command: gdb

GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-119.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
.
Undefined command: "new-ui". Try "help".
(gdb)

Reproduce the launch with gdbgui 0.15.0.1 and GNU GDB 7.6.1 on the reported command line, then trace how the startup session handles the unsupported "new-ui" command. Done means the reported GDB version no longer leaves the dashboard waiting indefinitely, with the behavior verified against the reproduction.

Written by the indexing model from the issue text.