Computerhilfen tech-tips

Unlike Apple's macOS system, drives on the Raspberry Pi with Raspbian cannot be safely removed or ejected directly from a folder window: On the Mac, there is a button for ejecting the drive in the folder's view. This is missing under Raspian: Here drives are also shown as folders in the sidebar, they are usually mounted under "media".To eject and unmount these drives safely, there is the possibility to do this from the console. But you can also ej... Read more...

UnBounce is a practical, but often not very flexible editor for websites and landing pages: With it, individual pages can be clicked together with little effort. If you activate the mobile view, UnBounce distinguishes between desktop computers and mobile devices such as a smartphone or a tablet: You can also create completely different pages for both sizes.However, you often want to know whether UnBounce is currently displaying the desktop view or the ... Read more...

To change the volume of the Raspberry Pi and turn the computer up or down, you don't need a mouse or screen: This can also be done over the network via SSH. To do this, connect to the Raspberry (tip: Connect via SSH and activate SSH). Then you can activate the volume control with the following command:alsamixerThis starts the setting program shown in the picture above. Use the arrow keys (up and down) to change the volume: this is also shown gr... Read more...

The new Raspberry Pi 4 seems to have problems with the WiFi, if a screen with a high resolution is connected via HDMI: The small computer even has two Micro-HDMI outputs in version 4, which can deliver a 4k image. If the Raspberry Pi is to be used as a media player on a high-definition TV, however, it is better to connect it via LAN cable: With the Pi 4 this is now also possible with Gigabit.At higher HDMI resolutions, the video signal should inter... Read more...

The Raspberry Pi usually comes with a standard password for logging in. However, this should be changed quickly as it is a security risk: Anyone else can log in with the same password. Since mid-2019 Raspbian does not allow short passwords anymore: They must contain at least six letters.If you still want a shorter password (or no password at all), you can use a trick to set it up: To do this, you don't change it directly your your own user, usually... Read more...

After the first setup of the Raspberry's microSD card you can start the small computer: Once it has loaded all services, you need a password to log in: The Raspberry Pi default password for the login under Raspbian is always the same: No matter which Raspberry Pi and which Raspbian version you use, you can always log in with the same password. Therefore you should change the default password quickly: Otherwise other users will also have easy access to ... Read more...

In Google's search engine and the Google services are hidden numerous "eastereggs": These small jokes or even whole games can usually only be found by chance. Google shows one of the hidden eastereggs when you search for "<marquee>". This is the HTML command for a scrolling text. The Marquee command was introduced by Microsoft's Internet Explorer and are now also supported by the Firefox and Chrome browsers: However, the Firefox developers have c... Read more...

(Please click here for the german version)If the Raspberry Pi responds with the error message "Repository 'https://raspbian.raspberrypi.org/raspbian buster InRelease' changed its 'Suite' value from 'testing' to 'stable'", this simple trick will help: Since Raspbian Buster is now officially available as a "stable" version, you have to confirm this once: Then you can install new software again with "apt-get" without any problems.Before installing,... Read more...

A Google update for the Chrome browser is supposed to stop the Mac from working when Apple's System Integration Protection (SIP) is turned off: Then the Chrome Update deletes the symlink "/var", which is important for the operating system, reports Mr. Macintosh. This folder is needed for Linux and Mac systems and should point to "private/var" on a Mac: Without it the Mac won't start anymore.Affected by this problem are macOS 10.9 and 10.10: Apple's... Read more...

With the desktop version of Raspbian, but also with Debian or Ubuntu often come screen savers. They only make limited sense because they consume a lot of unnecessary resources on the small Raspberry Pi: Here it helps more to turn off the screen when it's not needed.If you want to remove the automatically installed screensavers, this short command will help you in a Linux console:sudo apt-get remove xscreensaverWith "sudo" you'll get root rights... Read more...