linux command to find serial number of Lenovo laptop

Problem

You would like to find out the serial number of your Lenovo laptop, but without switching it off and taking the battery off.

Solution

You can run the following to get your laptop’s details including the serial number:

Taken from the post here

Error installing json 1.8.3 with ruby 2.4

Problem

You are trying to install the gems for your rails application in a new computer, or by using ruby 2.4 and you get the following error:

Solution

Remove your old Gemfile.lock file and run bundle again. A newer version of json (ie 1.8.6) should be installed.

FATAL -> Failed to fork – Digital Ocean – Debian – Docker

Problem

When you are trying to install a package inside a debian Docker container you get the following error message:

Solution

This is an indication of ‘out of memory’ so add a swap partition if it does not exist, on the host with the following:

(Thanks Valent)