Debian Buster: Enable TTY inside KVM guests

When spinning up a new Debian VM using KVM virsh console <vm> does not work. The VM needs a running TTY for this: systemctl enable serial-getty@ttyS0.service systemctl start serial-getty@ttyS0.service

January 12, 2020

Chrome 56: Install and use Extensions

Starting with Chrome 56 on Debian you might end up having no Extensions. To re-enable them again you have to start Chrome with --enable-remote-extensions To make this a default add this flag to the default flags in /etc/chromium.d/default-flags: # Enable extensions export CHROMIUM_FLAGS="$CHROMIUM_FLAGS --enable-remote-extensions" Reference:

March 1, 2017

Waiting for server to accept SSH connections

Sometimes you need to wait for a just booted server to accept SSH connections. This can be solved with a one-line bash script: until nc -w 10 -z $SERVER_IP 22; do echo "SSH not available" && sleep 5; done

October 22, 2016

npm install fails with "npm ERR! tar.unpack untar error"

Problem npm failed randomly while installing packages. It didn’t matter which packages or if running on Debian itself or inside virtual machines using Ubuntu (vagrant). Upgrading npm to the latest version (sudo npm install -g npm@latest ) and clearing npm’s cache (npm cache clean ) didn’t help either. After examining the downloaded temporary packages in /tmp I realized that they were corrupt. The corrupt packages changed randomly on every download attempt....

April 25, 2016

Simulate the environment of Cron Jobs

Often you will find yourself in the situation that one of your cron jobs works perfectly if you execute it manually but fails as soon as is gets executed by cron. The root cause might be the different environment. To simulate the environment of a cron job add the following entry to your crontab using crontab -e. This will create the file cronenv in your root directory and dump all available environment variables into it....

March 21, 2016

Gnome 3: Minimize, Maximize and Close on the left

gsettings set org.gnome.desktop.wm.preferences button-layout 'close,maximize,minimize,close:'

October 11, 2015

Debian 8: gdm3 crashes instantly with "Oh no! Something has gone wrong"

After upgrading several Gnome 3 (and other) packages and rebooting I was unable to get to the gdm3 login screen. It crashed instantly with the message “Oh no! Something has gone wrong”. After checking various log files and consulting the internet I found a bug report which provided a (very simple) solution: sudo adduser Debian-gdm video That’s it.

October 8, 2015

seafile-cli: "waiting for sync" and "status unknown"

If you’re runing the latest version of seafile-cli (4.3.2) on Debian you might encounter the following error in your seafile.log: http-tx-mgr.c(653): libcurl failed to GET https://domain.tld/seafhttp/protocol-version: Problem with the SSL CA cert (path? access rights?). This is because the client is built on CentOS where the CA certificates reside in a different location. Luckily there is an easy fix available (see : sudo mkdir -p /etc/pki/tls/certs sudo cp /etc/ssl/certs/ca-certificates.crt /etc/pki/tls/certs/ca-bundle....

September 14, 2015

fix mouse pointer speed in Gnome 3.16

When upgrading to Gnome 3.16 you might find yourself in the situtation that your mouse pointer speed has changed. To revert this run the following command: /usr/bin/xset m default

July 3, 2015

Apache 2: [authz_core:error] client denied by server configuration

When upgrading Apache to version 2.4 some of your config files need to be changed. Allow from all needs to be changed to Require all granted Otherwise your virtualhost config is not correct and Apache won’t work correctly.

May 23, 2015