Category Archives: Linux

Audio, Linux

HiFi/HiRes Audio in Linux/Pipewire

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First off, I want to say that I’m not an audio expert, but I could say I’m an enthusiast, so don’t expect anything marvelous from what I’m writing… Initially, I had an old SoundBlaster X-Fi (below average), I used it with the RCA output and a converter to 3.5mm, eventually, I upgraded to a FiiO BTR15 DAC and was surprised that with newer hardware I couldn’t achieve an audio quality level anywhere close to what I had with my SoundBlaster.

Spoiler alert: This journey is crazy, since not everything is as “plug and play” as one would hope, so I decided to see what would happen if I thoroughly checked and finally found some configuration parameters that greatly improved the audio quality.

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Fedora, Linux, System Administration

Things to test in fedora 40 KDE (no X11)

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I have a personal list that I want to test in Fedora 40 with KDE 6… I will update the results after the release…

  • KeePassXC AutoType
  • ssh -X (I want to execute some visual app from a remote host running F40 and from F40)
  • Installing it in a qemu/kvm VM… (and GUI performance!)
  • KRFB (VNC)
  • xrdp
  • fullscreen sharing (like google meet, zoom?)
  • program sharing thumbnails
  • HIDPI behaviour (4K)
  • Nvidia card performance…

Cryptography, Information Security, Linux, Network Administration, System Administration

Solving the openvpn_execve Error in LXC

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Problem Description:

When running OpenVPN in an LXC environment, users may encounter a specific error that prevents the OpenVPN service from operating correctly. The error manifests as follows:

Jan 08 00:56:47 fw openvpn[404]: openvpn_execve: unable to fork: Resource temporarily unavailable (errno=11)
Jan 08 00:56:47 fw openvpn[404]: Exiting due to fatal error
Jan 08 00:56:47 fw systemd[1]: openvpn-client@yourvpn.service: Main process exited, code=exited, status=1/FAILURE
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Linux, System Administration

Installing VirtualBox-7.0 in OpenSUSE 15.x (or tumbleweed) from repo and UEFI Secure Boot Enabled

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This is a simple/short how to for installing VirtualBox 7 in OpenSUSE 15

Here we are handling two problems:

  1. There is no repo for OpenSUSE 15.4 (we need to do a trick)
  2. There is no documentation on how to create proper UEFI secure boot MOK’s (owner keys) for the newer OpenSUSE which demands that the key will have special attributes like “codeSigning“

so, here is the answer:

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Cryptography, Hardening, Information Security, Linux, Privacy, System Administration

Installing K-Ubuntu 16.04 with LVM+LUKS Full Encryption

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Kubuntu and mostly ubuntu installations comes with a very basic installer, and does not allow you to personalize the encryption, by example, if you have windows and linux together in the same hard drive, the installation won’t allow you to dual boot it, it will force you to use the whole disk, removing the existing windows partition.

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