Skype for Linux beta doesn’t add the repository public key to apt on Ubuntu

W: GPG error: stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1F3045A5DF7587C3
W: The repository ' stable InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
root@computer:~# apt-key adv --keyserver --recv-keys 1F3045A5DF7587C3
Executing: /tmp/tmp.UA1ZzOZ6hE/ --keyserver
gpg: requesting key DF7587C3 from hkp server
gpg: key DF7587C3: public key "Skype Linux Client Repository " imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)

How to watch a video from your computer on a Google Cast device? (Ubuntu Linux)

1) Install smplayer (

To install SMPlayer, just run these commands in a terminal:

$ sudo add-apt-repository ppa:rvm/smplayer
$ sudo apt-get update
$ sudo apt-get install smplayer smplayer-themes smplayer-skins

Continue reading “How to watch a video from your computer on a Google Cast device? (Ubuntu Linux)”

My samba configuration

Disable offloading for the network interface eth1:

# /sbin/ethtool -K eth1 tso off
# /sbin/ethtool -K eth1 gso off

Continue reading “My samba configuration”

Change Adblock Plus key binding (ctrl+shift+v) in Firefox

Open about:config and edit extensions.adblockplus.sidebar_key

Can not use mate desktop with x2go on Ubuntu 16.04

Add the following to $HOME/.profile:

export GSETTINGS_SCHEMA_DIR=/usr/share/mate:/usr/local/share:/usr/share
export XDG_DATA_DIRS=/usr/share/mate:/usr/local/share:/usr/share

Can not use x2go single application mode on Ubuntu 16.04

# systemctl stop x2goserver

Add 'X2GO_NXAGENT_DEFAULT_OPTIONS=" -extension BIG-REQUESTS"' to /etc/x2go/x2goagent.options

# systemctl start x2goserver


The error message for this problem was a bit vague:

Error: Failure reading from the peer proxy.
Error: Connection with remote peer broken.
Error: Please check the state of your network and retry.

Problem with vlc and Intel integrated GPU

If you experience a problem with vlc so that the video is always on top of any other program, this xorg config snippet will help.

Add the following to /usr/share/X11/xorg.conf.d/20-intel.conf:

Section "Extensions"
    Option "XVideo" "Disable"

Change font rendering settings (KDE/Firefox)

$XDG_CONFIG_HOME/fontconfig == $HOME/.config/fontconfig

On Ubuntu XDG_CONFIG_HOME is not defined. Its value defaults to $HOME/.config.

Edit $HOME/.config/fontconfig/fonts.conf:

<?xml version='1.0'?> 
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'> 
 <match target="font"> 
  <edit mode="assign" name="autohint"> 
 <match target="font"> 
  <edit mode="assign" name="rgba"> 
 <match target="font"> 
  <edit mode="assign" name="hinting"> 
 <match target="font"> 
  <edit mode="assign" name="hintstyle"> 
 <match target="font"> 
  <edit mode="assign" name="antialias"> 
 <match target="font"> 
  <edit mode="assign" name="lcdfilter"> 
$ mkdir $HOME/.fonts
$ fc-cache -fv

How to create an ext3 file system on a USB stick ?

# export USB_DEVICE_PARTITION=/dev/sdXn
# mkfs.ext3 -v -O sparse_super -O has_journal -E stride=2,stripe-width=1024 -b 4096 ${USB_DEVICE_PARTITION}
# tune2fs -o journal_data_writeback ${USB_DEVICE_PARTITION}
# tune2fs -c 0 -i 0 ${USB_DEVICE_PARTITION}

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