Shaba Piffer's questions

I tried to install fslint

:~# apt install fslint

and I received

Package fslint is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'fslint' has no installation candidate

Well, fslint was avaliable in Ubuntu 19.10.

In the fslint website http://www.pixelbeat.org/fslint/ shows it is available for Ubuntu.

What happened?
Was it removed from the 20.04 repository?
Or they substituted for another package or name?

I ran

:~$ apt install pulseaudio-equalizer

An important detail, no icon was included in the Gnome Applications menu. I think it is important to fix it. So, I ran

:~$ qpaeq

and I received the error messages

Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use  QT_QPA_PLATFORM=wayland to run on Wayland anyway.
There was an error connecting to pulseaudio, please make sure you have the pulseaudio dbus module loaded, exiting…

I ran

:~$ pulseaudio

and I received the message

E: [pulseaudio] pid.c: Daemon already running.  
E: [pulseaudio] main.c: pa_pid_file_create() failed.

So, I loaded the modules that were missing

:~$ pactl load-module module-equalizer-sink  
:~$ pactl load-module module-dbus-protocol

and the equalizer opened and it didn't work (the sound wasn't changing).

Another important detail, why do theses modules are not loaded by default? I think this is another thing to be fixed.

I created the file ~/.config/pulse/default.pa with the lines

load-module module-equalizer-sink  
load-module module-dbus-protocol

and I restarted to check. After the Gnome login the computer start to "freeze" by some seconds. In this condition, if I run

:~$ pactl list modules short | grep module-dbus-protocol

the terminal stops until I do Crtl+C.

If I try to load some module (module-equalizer-sink or module-dbus-protocol) I received an error message. So strange...

I restarted the computer again and the "freezing" happened again. So, in this way I deleted the file ~/.config/pulse/default.pa to come back to the early situation. I restarted and the "freezing" didn't happened again.

I tried another solution. I installed

:~$ apt install pulseeffects

and the equalizer was not working. Looking the pulseeffects FAQ,

https://github.com/wwmm/pulseeffects/wiki/FAQ

I found a solution, to run

:~$ apt install lsp-plugins

Delete the folder ~/.config/gstreamer-1.0 (if it exists)

After to close the pulseeffects (if is opened) and run

:~$ dconf reset -f /com/github/wwmm/pulseeffects/

In this way, the equalizer of the pulseeffects worked.