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Unattended boot, Grub, Ubuntu and power failure.

What do these four things have in common? Ubuntu headless server will not boot after power failure as Grub will indefinitely wait for user input. The root of this problem lies inside Ubuntu default Grub configuration as Grub will simply set timeout to infinity when recordfail parameter is set.

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How to disable automatic mounting of the removable storage devices on Crunchbang

Today I went almost crazy because of automatic mounting and opening of the removable storage devices, fortunately this behavior can be quickly changed by the use of thunar-volman-settings command.

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Nexus 7 – Android 4.3 – bootloader problem

Recently I decided to upgrade my Nexus 7 to the Android 4.3 Jelly Bean, but quickly encountered InvalidState error when tried to update bootloader.

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Kolab – High CPU usage after adding a few aliases

Yesterday I added a few mail aliases using Kolab admin interface and went to sleep. Today I noticed high CPU usage and quickly found that there is a small problem with pykolab 0.5.11-5 package.

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WordPress and Login Security Solution – SQL query

Login Security Solution is a very useful plugin if you want to slow down brute force attacks, enforce password policies and timeout inactive sessions. It is also worth mentioning that it records the IP address of every failed login attempt so it is easy to integrate with your own solutions such as htaccess deny directive.

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Kolab and national characters in the mail subject

I am using mainly Polish language so it is obvious that fairly quickly I encountered a problem with national characters in the subject line. Problem is not fixed in Debian packages (using Debian Wheezy x86_64 and Kolab Systems – Public Repositories) but luckily it is very easy to fix.

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Kolab 3 and Debian Wheezy – Small LDAP issue and quick fix

Yesterday I experienced strange problem after Kolab 3 installation on Debian Wheezy as I couldn’t add an initial user account using admin interface.

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CentOS 6 – _netdev fstab option and netfs service

Yesterday I had a small problem. I have added GlusterFS mount point to the fstab but filesystem wasn’t mounted automatically after I rebooted the operating system (CentOS).

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CentOS 6 – RepoForge and Advanced Policy Firewall

Hmm… Today I hit funny problem as I couldn’t install Advanced Policy Firewall from RepoForge (RPMforge) repository on CentOS 6. Fortunately the solution is trivial and doesn’t require any magic…

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Google Chrome – Recent "Couldn't load plugin" error

Yesterday I experienced quite annoying “Couldn’t load plugin” error when I tried to play any video on YouTube. It started suddenly and I was very surprised by it.