Cannot star in ubuntu 18.04

[AnCMpi]

Sonic Pi Boot Error Report

System Information

• Sonic Pi version: 2.10.0
• OS: Ubuntu 18.04.6 LTS

GUI Log

/home/administrador/.sonic-pi/log/gui.log

[GUI] - using default editor colours
[GUI] - shutting down any old audio servers...
[GUI] - starting UDP OSC Server on port 4558...
[GUI] - UDP OSC Server ready and listening
[GUI] - booting live coding server
[GUI] - waiting for server to boot...
............................................................
[GUI] - Critical error! Could not boot server.

Server Errors

/home/administrador/.sonic-pi/log/server-errors.log

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
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
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
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
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
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Cannot create RT messagebuffer thread: Operation not permitted (1)
Retrying messagebuffer thread without RT scheduling
Messagebuffer not realtime; consider enabling RT scheduling for user
no message buffer overruns
Cannot create RT messagebuffer thread: Operation not permitted (1)
Retrying messagebuffer thread without RT scheduling
Messagebuffer not realtime; consider enabling RT scheduling for user
no message buffer overruns
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
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
...
...
...

Server Output

/home/administrador/.sonic-pi/log/server-output.log

Sonic Pi server booting...
Using protocol: udp
jackdmp 1.9.12
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2017 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
audio_reservation_init
Acquire audio card Audio0
creating alsa driver ... hw:0|hw:0|2048|3|44100|0|0|nomon|swmeter|-|32bit
configuring for 44100Hz, period = 2048 frames (46.4 ms), buffer = 3 periods
ALSA: final selected sample format for capture: 32bit integer little-endian
ALSA: use 3 periods for capture
ALSA: final selected sample format for playback: 32bit integer little-endian
Released audio card Audio0
audio_reservation_finish

Scsynth Output

/home/administrador/.sonic-pi/log/scsynth.log

[filandra]

@AnCMpi Afaik Ubuntu 18.04 is too old for the current version of Sonic Pi. I am using Ubuntu 22.04 and it's running flawlessly.
I recommend updating your system and using flatpak to install Sonic Pi.

To solve you issue:

1. Install new version of Ubuntu or some other distro using new Ubuntu under the hood (I'm using Tuxedo OS 2)
2. You need to install flatpak - on Tuxedo OS 2 it's already installed, but it's really easy to install it on Ubuntu as well.
3. You need to install Sonic Pi

This should solve your issue - I hope it helps!