Update error log

[bgaulke]

[member=5479]bgaulke[/member] [size=1em],[/size]

[size=1em]Try copying and pasting the following lines one at a time into a terminal.[/size]

Code:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5
sudo apt-get update

Thanks for the suggestion. This is the result:
Hit:1 http://archive.canonical.com/ubuntu bionic InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease                   
Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease                 
Ign:4 http://archive.canonical.com precise InRelease                         
Get:5 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB] 
Get:6 http://archive.canonical.com precise Release [8,180 B]                 
Hit:7 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease
Hit:8 http://dl.google.com/linux/chrome/deb stable Release                   
Get:9 http://archive.canonical.com precise Release.gpg [181 B]               
Hit:10 https://repo.skype.com/deb stable InRelease                           
Get:11 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB] 
Hit:13 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease       
Ign:9 http://archive.canonical.com precise Release.gpg                       
Get:14 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Hit:15 http://repo.linuxliteos.com/linuxlite diamond InRelease               
Reading package lists... Done                     
W: GPG error: http://archive.canonical.com precise Release: The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5
E: The repository 'http://archive.canonical.com precise Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure( 8) manpage for repository creation and user configuration details.