Google Play Store error: 'Insufficient storage available'

Installing apps on android-based systems can sometimes be a problem. The download works, but then... 'error'

After WhatsApp failed to work another time yesterday evening a message appeared that my version is too old and I should install the latest update.

So then I did what they wanted: I went to the Google Play Store and selected 'Update' to download the latest version.

After the download the software started to install. Or better it attempted to install. In the end it failed with the message 'Insufficient storage available'.

I remember having the error once before, I guess one and half years ago. Probably the error isn't only a WhatsApp problem.

Last time also the Facebook messenger failed to install.

So let's fix it: I deleted some files from the internal storage to get some space. I also removed some apps I don't need with the application manager.

After that I made a reboot of my phone and tried to install the application once again. This time the update worked and WhatsApp was running again.

Last time it didn't worked that way: After all attempts failed I decided to make a factory reset to 'solve' the issue.