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How to reset admin password on UniFi controller

Reset admin password on UniFi controller to access wireless configuration.

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How to fix undefined function utf8_decode error in PHP application

This is just another interesting problem to solve. I have encountered this subtle difference in PHP packages when I moved personal Dokuwiki instance from Debian Jessie to Debian Stretch.

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SysOps

How to configure HTTP/2 in http mode on HAProxy and fix bad request problem

Enable HTTP/2 on HAProxy 1.8 and temporarily fix the bad request problem with the Nginx backend using FastCGI/uWSGI.

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How to fix broken uwsgi package on Ubuntu Xenial

Recently, I tried to update uwsgi package on Ubuntu Xenial, but received an error about broken package. It looks like the mentioned package was pushed to the repository before its dependencies. This issue is thoroughly described in #1719363 bug report.

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How to fix missing dirmngr

Debian Stretch provides gnupg in minimal installation as the package priority is set to important. The command is fully operational, but it requires dirmngr to perform network operations for managing and downloading certificates.

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How to fix the missing HPE's public keys

HPE Software Delivery Repository is cryptographically signed, so you can be sure that provided software packages have not been modified by a third party. However, sometimes you can encounter the The following signatures couldn't be verified because the public key is not available error which can be easily fixed.

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GNOME Terminal, Midnight Commander and function keys

I have updated desktop computer to Debian Jessie. After that I have quickly encountered an issue with GNOME Terminal, Midnight Commander and already assigned F1 and F10 function keys.

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SysOps

How to enable VPN connections inside Network Manager

Default Debian installation does not include VPN support inside the Network Manager applet. The reason behind this decision is probably the variety of available solutions.

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SysOps

i915 and "Hangcheck timer elapsed" error

Since Debian Jessie installation, I have encountered Hangcheck timer elapsed error. It is a really nasty bug as the only way to escape frozen X Window System is to reboot the whole operating system.

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How to fix error when moving events between calendars

Recently, I noticed “Failed to save changes” error when tried to move events between distinct calendars.
After a short investigation I found that this bug is already fixed, but not packaged for an easy upgrade, so I will shortly describe how to apply fix for Debian Wheezy and Kolab 3.3.