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[Len Ovens <len@xxxxxxxxxxxxx>]

Can you please attach /etc/security/limits.conf and confirm that this
user in in the audio groups. (type groups in a terminal) Also please
include the output of uname -a

It sounds like you do not have the right permissions set for this user
to do low latency audio. In UbuntuStudio, the user setup in the install
is the only user on the system that is correctly set up to do audio
work. Any new user created after that will have to be added to the audio
group. Ardour2 and Ardour3 can be setup to run without trying to lock
memory or use realtime, but it is not a good way to run things. Ardour3
may complain about things Ardour2 silently ignored too.

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https://bugs.launchpad.net/bugs/1422682

Title:
  Ardour 3 - Jack can't use real-time scheduling (RR/5)

Status in Ubuntu Studio:
  New

Bug description:
  Ardour 2.8.16 looks to work properly but if I try to use Ardour 3, the following message appears and impede to the program to load: 
  -Error JACK cannot use real time scheduling RR/5 - 1: operation not allowed
  - Error Jack Jack client aquired self read time error
  - worning: your system has a limit for a maximum amount of self lock memory
  - impossible to load the session
  -Jack cannot create thread res=1

  the limit of the system (by typing "ulead -l" in terminal emulator) is
  64

  System in use:
  - Lenovo ideapad Z500 - Core I7
  - Roland VG99 guitar syntesizer via USB

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