whats wrong here
update command failed with invalid signature
root@dm900:~# apt update
Ign http://update.onestep.cc ./ InRelease
Ign http://dreamboxupdate.com ./ InRelease
Ign http://download.blue-panel.com ./ InRelease
Hit http://update.onestep.cc ./ Release.gpg
Ign http://dreamboxupdate.com ./ InRelease
Ign http://download.blue-panel.com ./ InRelease
Hit http://update.onestep.cc ./ Release
Ign http://dreamboxupdate.com ./ InRelease
Ign http://download.blue-panel.com ./ InRelease
Hit http://dreamboxupdate.com ./ Release.gpg
Ign http://download.blue-panel.com ./ InRelease
Hit http://dreamboxupdate.com ./ Release.gpg
Ign http://download.blue-panel.com ./ InRelease
Hit http://update.onestep.cc ./ Packages
Hit http://dreamboxupdate.com ./ Release.gpg
Get:1 http://download.blue-panel.com ./ Release.gpg [490 B]
Hit http://dreamboxupdate.com ./ Release
Hit http://download.blue-panel.com ./ Release.gpg
Hit http://dreamboxupdate.com ./ Release
Hit http://download.blue-panel.com ./ Release.gpg
Hit http://dreamboxupdate.com ./ Release
Hit http://download.blue-panel.com ./ Release.gpg
Hit http://download.blue-panel.com ./ Release.gpg
Ign http://update.onestep.cc ./ Translation-en
Hit http://download.blue-panel.com ./ Release
Hit http://download.blue-panel.com ./ Release
Hit http://download.blue-panel.com ./ Release
Hit http://download.blue-panel.com ./ Release
Hit http://dreamboxupdate.com ./ Packages
Get:2 http://download.blue-panel.com ./ Release [964 B]
Err http://download.blue-panel.com ./ Release
Hit http://dreamboxupdate.com ./ Packages
Hit http://dreamboxupdate.com ./ Packages
Ign http://dreamboxupdate.com ./ Translation-en
Hit http://download.blue-panel.com ./ Packages
Ign http://dreamboxupdate.com ./ Translation-en
Ign http://dreamboxupdate.com ./ Translation-en
Hit http://download.blue-panel.com ./ Packages
Hit http://download.blue-panel.com ./ Packages
Hit http://download.blue-panel.com ./ Packages
Ign http://download.blue-panel.com ./ Translation-en
Ign http://download.blue-panel.com ./ Translation-en
Ign http://download.blue-panel.com ./ Translation-en
Ign http://download.blue-panel.com ./ Translation-en
Fetched 1454 B in 6s (237 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://download.blue-panel.com ./ Release: The following signatures were invalid: BADSIG E7CE1D14D5EA8D10 gemini team (Gemini Plugin) <info@ihad.tv>
W: Failed to fetch http://download.blue-panel.com…i4-unstable/all/./Release
W: Some index files failed to download. They have been ignored, or old ones used instead.