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If the system shows these warning messages

mdadm: No arrays found in config file

mdadm: error opening /dev/md?*: No such file or directory

during startup you can fix it with these steps below:

• Open a terminal
• write this comand

  sudo update-initramfs -u

• then press Enter

The warnings will no longer appear at the next start.

Due to a typo on a third party software the live user is not present even though it is indicated on the login screen.

To remove it follow the steps below:

• open a terminal
• edit with root permission the file /etc/slim.conf
• search the line with default user live
• remove only the word live
• save changes and exit

Now, form the next startup, the user “live” is not present in login screen.