Kraus's questions

I am using Ubuntu Studio 20.04 with JACK through ubuntustudio-controls. I have a surround speaker system and must change the default pulse_out bridge sink from 2-channel stereo to 4-channel. The four channels must be mapped to front-left front-right rear-left rear-right. This does not seem to be an option through the GUI.

Alternatively, I can add an additional 2-channel Output bridge, but the channels would still need to be mapped to the rear speakers. There doesn't seem to be any way of doing that either.

Making a single 4-channel output bridge would be preferable.

This could normally be manually configured through pacmd load-module module-jack-sink sink_name=Surround client_name=Surround channels=4 connect=no but Ubuntu Studio Controls wipes out any manual changes once "Start or Restart Jack" is clicked. If no solution is available, it seems avoiding Ubuntu Studio Controls would be the only option. Sadface.

I can imagine this would be an important feature since many professional musicians, studio engineers and audiophiles have 5.1 and 7.1 surround speaker systems, but the wiki page has no information on the subject.

How can I configure the number of channels in an Output Bridge through Ubuntu Studio Controls?

According to Wikipedia's utf-8 Codepage Layout, its character-set is as follows:

! " # $ % & ' ( ) * + , - . / 0-9 : ; < = > ? @ A-Z [ \ ] ^ _ ` a-z { | } ~

But (excepting /), filenames beginning with these character are sorted by name differently:

! " # % & ' ( ) * + , - : ; < = > ? @ [ \ ] ^ _ ` { | } ~ 0-9 $ a A z Z

Why is this? Does it have to do with the file system? File Manager? Locale? Something else?

I am on Ubuntu Server 20.04, running Samba version 4.11.6-Ubuntu. I need to modify a Samba user account, but I am unable to open sam.ldb due to it apparently not being present. Here is the output:

$ samba-tool user edit username
ltdb: tdb(/var/lib/samba/private/sam.ldb): tdb_open_ex: could not open file /var/lib/samba/private/sam.ldb: No such file or directory

Unable to open tdb '/var/lib/samba/private/sam.ldb': No such file or directory
Failed to connect to 'tdb:///var/lib/samba/private/sam.ldb' with backend 'tdb': Unable to open tdb '/var/lib/samba/private/sam.ldb': No such file or directory
ERROR(ldb): uncaught exception - Unable to open tdb '/var/lib/samba/private/sam.ldb': No such file or directory
  File "/usr/lib/python3/dist-packages/samba/netcmd/__init__.py", line 186, in _run
    return self.run(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/samba/netcmd/user.py", line 2435, in run
    samdb = SamDB(url=H, session_info=system_session(),
  File "/usr/lib/python3/dist-packages/samba/samdb.py", line 65, in __init__
    super(SamDB, self).__init__(url=url, lp=lp, modules_dir=modules_dir,
  File "/usr/lib/python3/dist-packages/samba/__init__.py", line 115, in __init__
    self.connect(url, flags, options)
  File "/usr/lib/python3/dist-packages/samba/samdb.py", line 81, in connect
    super(SamDB, self).connect(url=url, flags=flags,

I cannot list users either. I haven't tried any other subcommands yet.

I checked the folder it's referring to. Here are the contents:

$ ls
msg.sock  netlogon_creds_cli.tdb  passdb.tdb  secrets.ldb  secrets.tdb

The Samba server is running only as a File Server. I'm not running an LDAP (as far as I know). I installed Samba originally under Ubuntu Server 18.04. Other than adding shares to the .conf file I've never made any modifications to the installation.