Category Archives: Linux

Testing Fedora 40 KDE (RC1)

Fedora 40 + KDE 6 (Wayland): Quick Reality Check

Things I Tested (and What Actually Happened)

A few days ago, I was genuinely worried about this release. KDE 6 on Wayland is known for breaking quite a few workflows, so I prepared a checklist in advance of things I absolutely needed to test in Fedora 40 KDE (no X11 by default). You can find that checklist here: https://www.unmanarc.com/en/2024/02/things-to-test-in-fedora-40-kde-no-x11/. Let’s see how things actually turned out.

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HiFi/HiRes Audio in Linux/Pipewire

First of all, I want to clarify that I’m not an audio expert—just an enthusiast—so don’t expect anything too scientific or magical from what I’m about to share. For a long time, I used an old SoundBlaster X-Fi (honestly, nothing special) connected through its RCA outputs and adapted to 3.5 mm. Eventually, I decided to upgrade to a FiiO BTR15 DAC, expecting a clear improvement. To my surprise, with newer and supposedly better hardware, I couldn’t initially reach the audio quality I was used to with the SoundBlaster.

Spoiler alert: this journey turned out to be way crazier than expected. Audio is not always as “plug and play” as one might hope. After digging deeper and carefully reviewing configurations, I finally found a few parameters that made a very noticeable difference in sound quality.

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Things to test in fedora 40 KDE (no X11)

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…

Solving the openvpn_execve Error in LXC

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

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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Installing K-Ubuntu 16.04 with LVM+LUKS Full Encryption

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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