Geeky Redhat Ubuntu

freerdp / xfreerdp

No, no, no, the message “If credentials are valid, the NTLMSSP implementation may be to blame” is kind of misleading.

However, the hostname needs to be the last argument on the list.

Geometry for my business portrait screen:

xfreerdp -u administrator -g 1170x1830


Ubuntu Zimbra

Zimbra Bricollage

Damit es nicht vergessen geht. Falsch gemachtes Zimbra Updgrade zusammen mit LTS Upgrade.

Siehe auch

Zimbra Pakete deinstallieren:
dpkg --get-selections | grep zimbra | awk '{ print $1 }' | xargs apt-get -y remove

Sparse Files:

Fix LDAP Sparse File:

How to upgrade with Ubuntu dist-upgrade:
How to upgrade Zimbra/ZCS 8.8 GA from Ubuntu 14.04 LTS to 16.04 LTS
KVM Snapshots
Ubuntu Virtualisation

Thinlinc on Ubuntu 16.04

Ubuntu 16.04 Xenial is not yet officially supported by Thinlinc 4.6. However, with just some additional dependencies, it is working.

Additional packages needed:
apt-get install lsb-core python python2 python-gtk2 python-apt

Check if /var/lib/lsb exists. If not, create this directory as root.

Install Thinlinc as usual.

To have MATE as desktop environment available, use the following meta package:
apt-get install mate-desktop

In my scenario, I use a single Master server built from a freshly installed Xenial Desktop (Unity), let Unity greeter still exist and have Mate as additional Desktop to choose. Like this, my VDI is accessible on small bandwith connections and with a Raspberry Pi 2 as Thin Client using RPiTC.


Linux/Windows Dualboot Zeit-Problem

Echtzeit-Uhr unter Windows auf UTC stellen

Und damit ich es gleich noch kopiert habe:


DWORD32 erstellen: RealTimeIsUniversal=1

Ubuntu Uncategorized

git random commit message

git log --pretty=format:"%s" | shuf | head -n 1
Geeky Ubuntu

Multi-Homed Network und rp_filter

Ganz kurz notieren, eine schlaue Anleitung muss ich noch schreiben.

Bei Multi-Homed Servern geht der Traffic aus dem richtigen Interface raus mit folgender Sysctl Variable:

sysctl net.ipv4.conf.eth0.rp_filter=2
sysctl net.ipv4.conf.eth1.rp_filter=2


Ubuntu Uncategorized

Pulse Audio Volume Control over Shell

export PULSE_RUNTIME_PATH=/var/run/pulse
 $> pacmd # gibt die pulse audio shell
 set-sink-mute 0 0


Gently getting rid of too many disturbing processes:

ps auxww | grep "too many processes of" | awk '{ print $2 }' | xargs -n1 kill
Ubuntu Zimbra

Upgrading Zimbra and Ubuntu to 8.6 and Trusty

I’ve started with Zimbra 8.0.7 and Ubuntu Precise. The goal was to have both OS and ZCS at the newest stable version. Here was my way to do it:

  • Upgrading ZCS to 8.0.9 (latest 8.0) for Ubuntu12
  • Installing HWE Kernel Packages for Precise
  • Upgrading ZCS to 8.6 using Ubuntu12 Packages
  • Dist-upgrading Ubuntu to Trusty

So far so good. After the dist-upgrade to trusty, Zimbra will not start anymore. This was somehow predicted. But running the Zimbra Installer for Ubuntu14 just bailed out, giving an Perl library error.

The trick was, to use the with the following option:

./ –skip-upgrade-check

Additionally, also skip the database integrity check (for this time). This did the trick for me.

Hardware Ubuntu

Ubuntu 13.10 on Lenovo Ideapad Yoga 2 Pro 13

Installing and using Ubuntu 13.10 have some pitfalls. This is a diary of my installation attempt. Although I consider my installation as merely stable, and I’ve already put all the necessary files and configs upon, I am not sure, whether this installation is final.

Identified and solved Problems with Ubuntu 13.10

– Dislplay only works, when the following Kernel parameter is set: acpi_backlight=vendor
– Kernel module ideapad_laptop is loaded automatically, which makes the WLAN and Display brightnes keys not working. Blacklisting or rmmod-ing the Kernel module works.

Resizing Windows Partition

As described, using Windows 8.1 is not my cup of tea. Resizing the Windows partition was merely an adventure, because I could not find the Computer Manager I was used to from Windwos XP and 7. How ever, got to the Classic Desktop, right click the Windows (former Start) symbol in the lower left corner, I found the Computer Manager. On the device manager, the Windows partition was able to be resized down to half of the 256GB SSD.

BIOS Settings

Plug-in the Ubuntu USB stick before you proceed.

To open BIOS/EFI settings, you need to power down the system and start it up with the separate very tiny key right to the power key.

In BIOS settings, disable FastBoot and change the boot priority to start up from USB first.

Booting Ubuntu Installer from USB

While having the Grub menu from the USB stick on display, press e to edit the Grub options. On the Kernel load line, add ‘acpi_backlight=vendor’ before the ‘quiet’ option. Press F10 to load these settings – don’t forget to push the Fn key to get F10.

Before Installing: WLAN and Display Resolution

Use the Try Ubuntu First mode to change some settings first before you install Ubuntu to the disk.

Ubuntu uses maximum resolution by default. However, 3400×1800 on 13.3″ is too high dpi to really use it. Use the Display Settings to switch back to Full HD 1920×1080.

To enable Wifi, unload the ideapad_laptop kernel module by typing:
sudo rmmod ideapad_laptop

Give it some time, then you can select your Wifi in network manager as usual.

Use gparted to reduce the Windows partition to the desired value.

Then, install Ubuntu as usual.

Starting Up the First Time

While rebooting into your newly installed Ubuntu, re-add the kernel option ‘acpi_backlight=vendor’. Since Grub is using the full resolution and is doing a full refresh on every keystroke, Grub is practically unusuable. Have patience.

Grub Resolution and Kernel Tweaking

On you newly bootet Ubuntu installation, change /etc/default/grub with the following:
GRUB_CMDLINE_LINUX_DEFAULT=”acpi_backlight=vendor quiet splash”

Use update-grub to have those settings persistent.

To have wifi and screen brightnes buttons working, black list the ‘ideapad_laptop’ kernel module. In /etc/modprobe.d/ I created a file “blacklist-ideapad_laptop.conf”, and in it, I put “blacklist ideapad_laptop”.

Like before, display resolution of 1920×1080 seems to be very comfortable and cozy on this ultrabook. Using the full resolution and higher the font sizes does not work like expected. On Gnome3 Flashback, the top panel is empty afterwards.

Unresolved Problems so Far

– Touchpad is way too sensitive, unable to press a button without moving the cursor
– Using full resolution
– Switching Function Keys / Multimedia Keys
– Rotating the display does not rotate the touch screen. Like this, tent mode is not really usuable.
Helpful sources

I was relying my installation attempt on the following sources:


Thank you so much for your helpful descriptions!