I downloaded Ardour yesterday, it worked, edited an audio file done. Come back today it wont start I get this:

Ardour could not start JACK 

There are several possible reasons:

1) You requested audio parameters that are not supported..
2) JACK is running as another user.

Please consider the possibilities, and perhaps try different parameters.

So I try and look at qjackctl to see what happening there. When I try to start JACK I get

D-BUS: JACK server could not be started.

then

Could not connect to JACK server as client.
- Overall operation failed.
- Unable to connect to server.
Please check the messages window for more info.

and this is the message box in JACK.

15:22:12.927 Patchbay deactivated.
15:22:12.927 Statistics reset.
15:22:12.944 ALSA connection change.
15:22:12.951 D-BUS: Service is available (org.jackaudio.service aka jackdbus).
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
15:22:12.959 ALSA connection graph change.
15:22:45.850 ALSA connection graph change.
15:22:46.021 ALSA connection change.
15:22:56.492 ALSA connection graph change.
15:22:56.624 ALSA connection change.
15:23:42.340 D-BUS: JACK server could not be started. Sorry
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
Wed Oct 23 15:23:42 2013: Starting jack server...
Wed Oct 23 15:23:42 2013: JACK server starting in realtime mode with priority 10
Wed Oct 23 15:23:42 2013: ERROR: Cannot lock down 82274202 byte memory area (Cannot allocate memory)
Wed Oct 23 15:23:42 2013: Acquired audio card Audio0
Wed Oct 23 15:23:42 2013: creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|nomon|swmeter|-|32bit
Wed Oct 23 15:23:42 2013: ERROR: 
ATTENTION: The playback device "hw:0" is already in use. The following applications  are using your soundcard(s) so you should  check them and stop them as necessary before  trying to start JACK again:
pulseaudio (process ID 2553)
Wed Oct 23 15:23:42 2013: ERROR: Cannot initialize driver
Wed Oct 23 15:23:42 2013: ERROR: JackServer::Open failed with -1
Wed Oct 23 15:23:42 2013: ERROR: Failed to open server
Wed Oct 23 15:23:43 2013: Saving settings to "/home/drew/.config/jack/conf.xml" ...
15:26:41.669 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
15:26:49.006 D-BUS: JACK server could not be started. Sorry
Wed Oct 23 15:26:48 2013: Starting jack server...
Wed Oct 23 15:26:48 2013: JACK server starting in non-realtime mode
Wed Oct 23 15:26:48 2013: ERROR: Cannot lock down 82274202 byte memory area (Cannot allocate memory)
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
Wed Oct 23 15:26:48 2013: ERROR: cannot register object path "/org/freedesktop/ReserveDevice1/Audio0": A handler is already registered for /org/freedesktop/ReserveDevice1/Audio0
Wed Oct 23 15:26:48 2013: ERROR: Failed to acquire device name : Audio0 error : A handler is already registered for /org/freedesktop/ReserveDevice1/Audio0
Wed Oct 23 15:26:48 2013: ERROR: Audio device hw:0 cannot be acquired...
Wed Oct 23 15:26:48 2013: ERROR: Cannot initialize driver
Wed Oct 23 15:26:48 2013: ERROR: JackServer::Open failed with -1
Wed Oct 23 15:26:48 2013: ERROR: Failed to open server
Wed Oct 23 15:26:50 2013: Saving settings to "/home/drew/.config/jack/conf.xml" ...
15:26:52.441 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
15:26:55.997 D-BUS: JACK server could not be started. Sorry
Wed Oct 23 15:26:55 2013: Starting jack server...
Wed Oct 23 15:26:55 2013: JACK server starting in non-realtime mode
Wed Oct 23 15:26:55 2013: ERROR: Cannot lock down 82274202 byte memory area (Cannot allocate memory)
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
Wed Oct 23 15:26:55 2013: ERROR: cannot register object path "/org/freedesktop/ReserveDevice1/Audio0": A handler is already registered for /org/freedesktop/ReserveDevice1/Audio0
Wed Oct 23 15:26:55 2013: ERROR: Failed to acquire device name : Audio0 error : A handler is already registered for /org/freedesktop/ReserveDevice1/Audio0
Wed Oct 23 15:26:55 2013: ERROR: Audio device hw:0 cannot be acquired...
Wed Oct 23 15:26:55 2013: ERROR: Cannot initialize driver
Wed Oct 23 15:26:55 2013: ERROR: JackServer::Open failed with -1
Wed Oct 23 15:26:55 2013: ERROR: Failed to open server
Wed Oct 23 15:26:57 2013: Saving settings to "/home/drew/.config/jack/conf.xml" ...
15:26:59.054 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
15:29:24.624 ALSA connection graph change.
15:29:24.641 ALSA connection change.
15:33:11.760 D-BUS: JACK server could not be started. Sorry
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
Wed Oct 23 15:33:11 2013: Starting jack server...
Wed Oct 23 15:33:11 2013: JACK server starting in non-realtime mode
Wed Oct 23 15:33:11 2013: ERROR: Cannot lock down 82274202 byte memory area (Cannot allocate memory)
Wed Oct 23 15:33:11 2013: ERROR: cannot register object path "/org/freedesktop/ReserveDevice1/Audio0": A handler is already registered for /org/freedesktop/ReserveDevice1/Audio0
Wed Oct 23 15:33:11 2013: ERROR: Failed to acquire device name : Audio0 error : A handler is already registered for /org/freedesktop/ReserveDevice1/Audio0
Wed Oct 23 15:33:11 2013: ERROR: Audio device hw:0 cannot be acquired...
Wed Oct 23 15:33:11 2013: ERROR: Cannot initialize driver
Wed Oct 23 15:33:11 2013: ERROR: JackServer::Open failed with -1
Wed Oct 23 15:33:11 2013: ERROR: Failed to open server
Wed Oct 23 15:33:12 2013: Saving settings to "/home/drew/.config/jack/conf.xml" ...
15:34:09.439 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started