Debian jessie KEYEXPIRED アップグレード [重複]

エラーが発生しました。

W：GPGエラー：http://http.debian.net発行者：jessie：次の署名が無効です：KEYEXPIRED 1668891673

オペレーティングシステムを更新しています。 /etc/debian_version:

8.11

/etc/sources/list:

deb http://http.debian.net/debian/ jessie main contrib non-free
deb-src http://http.debian.net/debian/ jessie main contrib non-free

deb http://security.debian.org/ jessie/updates main contrib non-free
deb-src http://security.debian.org/ jessie/updates main contrib non-free

#deb http://deb.debian.org/debian jessie-updates main contrib non-free
#deb-src http://deb.debian.org/debian jessie-updates main contrib non-frew

apt-getupdate:

# apt-get clean
# apt-get update
Hit http://security.debian.org jessie/updates Release.gpg
Hit http://security.debian.org jessie/updates Release
Get:1 http://http.debian.net jessie Release.gpg [1,652 B]
Hit http://security.debian.org jessie/updates/main Sources      
Hit http://security.debian.org jessie/updates/contrib Sources     
Hit http://security.debian.org jessie/updates/non-free Sources    
Hit http://http.debian.net jessie Release                         
Hit http://security.debian.org jessie/updates/main armhf Packages  
Hit http://security.debian.org jessie/updates/contrib armhf Packages
Hit http://security.debian.org jessie/updates/non-free armhf Packages
Hit http://security.debian.org jessie/updates/contrib Translation-en
Ign http://http.debian.net jessie Release                          
Hit http://security.debian.org jessie/updates/main Translation-en  
Hit http://security.debian.org jessie/updates/non-free Translation-en
Ign http://http.debian.net jessie/main Sources/DiffIndex          
Ign http://http.debian.net jessie/contrib Sources/DiffIndex
Ign http://http.debian.net jessie/non-free Sources/DiffIndex
Ign http://http.debian.net jessie/main armhf Packages/DiffIndex
Ign http://http.debian.net jessie/contrib armhf Packages/DiffIndex
Ign http://http.debian.net jessie/non-free armhf Packages/DiffIndex
Hit http://http.debian.net jessie/contrib Translation-en
Hit http://http.debian.net jessie/main Translation-en
Hit http://http.debian.net jessie/non-free Translation-en
Hit http://http.debian.net jessie/main Sources                           
Hit http://http.debian.net jessie/contrib Sources  
Hit http://http.debian.net jessie/non-free Sources 
Hit http://http.debian.net jessie/main armhf Packages
Hit http://http.debian.net jessie/contrib armhf Packages
Hit http://http.debian.net jessie/non-free armhf Packages
Ign http://http.debian.net jessie/contrib Translation-en_US                                                                                              
Ign http://http.debian.net jessie/main Translation-en_US                                                                                                 
Ign http://http.debian.net jessie/non-free Translation-en_US                                                                                             
Fetched 1,652 B in 28s (57 B/s)                                                                                                                          
Reading package lists... Done
W: GPG error: http://http.debian.net jessie Release: The following signatures were invalid: KEYEXPIRED 1668891673

パッケージをダウンロードしdebian-archive-keyring_2021.1.1_all.debて手動でインストールしようとしました。

# dpkg -i /home/olimex/debian-archive-keyring_2021.1.1_all.deb 
dpkg-deb: error: archive '/home/olimex/debian-archive-keyring_2021.1.1_all.deb' contains not understood data member control.tar.xz, giving up
dpkg: error processing /home/olimex/debian-archive-keyring_2021.1.1_all.deb (--install):
 subprocess dpkg-deb --control returned error exit status 2
Errors were encountered while processing:
 /home/olimex/debian-archive-keyring_2021.1.1_all.deb

どうすればいいですか？