[Ubuntu Wiki] Update of "Debug Symbol Packages" by lathiat

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The "Debug Symbol Packages" page has been changed by lathiat:
http://wiki.ubuntu.com/Debug%20Symbol%20Packages?action=diff&rev1=7&rev2=8

Comment:
add gpg key expiry info

   {{{#!highlight bash
  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F2EDC64DC5AEE1F6B9C621F0C8CAB6595FDFF622
  }}}
+ 
+     Note: The GPG key expired on 2021-03-21 and may need updating by either upgrading the ubuntu-dbgsym-keyring package or re-running the apt-key command. Please see [[https://bugs.launchpad.net/ubuntu/+source/ubuntu-keyring/+bug/1920640|Bug #1920640]] for workaround details if that does not work.
  
   1. Then run the following to update your package list or click the ''Reload'' button if you used the Synaptic Package Manager.
   {{{#!highlight bash