Error updating please help!

[musicianfree]

Thanks for your time and your help. The problem was solved.  Best wishes!  Thanks!
[member=48741]musicianfree[/member]
Try the below in terminal.... 

Code:

curl https://repo.skype.com/data/SKYPE-GPG-KEY | sudo apt-key add -

Can also see https://askubuntu.com/questions/1348146/...clear-this