Instalando o PHP4 em um Debian (lenny) 7 32bit box

Question

Eu estou tentando instalar o PHP4 em uma caixa Debian de 32 bits, mas eu corri para o seguinte

 root@php4:~# apt-get update
 Get:1 http://snapshot.debian.org lenny Release.gpg [189 B]
 Hit http://snapshot.debian.org lenny Release
 Ign http://snapshot.debian.org lenny Release
 Hit http://snapshot.debian.org lenny/main Sources/DiffIndex
 Hit http://snapshot.debian.org lenny/main i386 Packages/DiffIndex
 Hit http://ftp.us.debian.org wheezy Release.gpg
 Hit http://security.debian.org wheezy/updates Release.gpg
 Ign http://snapshot.debian.org lenny/main Translation-en_US
 Ign http://snapshot.debian.org lenny/main Translation-en
 Hit http://ftp.us.debian.org wheezy Release
 Hit http://security.debian.org wheezy/updates Release
 Hit http://ftp.us.debian.org wheezy/main i386 Packages
 Hit http://ftp.us.debian.org wheezy/main Translation-en
 Hit http://security.debian.org wheezy/updates/main i386 Packages
 Hit http://security.debian.org wheezy/updates/main Translation-en
 Fetched 189 B in 0s (229 B/s)
 Reading package lists... Done
 W: GPG error: http://snapshot.debian.org lenny Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A70DAF536070D3A1

Eu fiz o seguinte para corrigi-lo

 gpg --keyserver hkp://subkeys.pgp.net --recv-keys A70DAF536070D3A1
 gpg --export --armor A70DAF536070D3A1 | sudo apt-key add -

Agora recebo o seguinte erro KEYEXPIRED e não sei como corrigir. Mesmo o Google não ajuda

 root@php4:~# apt-get update
 Get:1 http://snapshot.debian.org lenny Release.gpg [189 B]
 Hit http://snapshot.debian.org lenny Release
 Ign http://snapshot.debian.org lenny Release
 Hit http://snapshot.debian.org lenny/main Sources/DiffIndex
 Hit http://security.debian.org wheezy/updates Release.gpg
 Hit http://snapshot.debian.org lenny/main i386 Packages/DiffIndex
 Hit http://ftp.us.debian.org wheezy Release.gpg
 Hit http://security.debian.org wheezy/updates Release
 Ign http://snapshot.debian.org lenny/main Translation-en_US
 Hit http://ftp.us.debian.org wheezy Release
 Hit http://security.debian.org wheezy/updates/main i386 Packages
 Ign http://snapshot.debian.org lenny/main Translation-en
 Hit http://ftp.us.debian.org wheezy/main i386 Packages
 Hit http://security.debian.org wheezy/updates/main Translation-en
 Hit http://ftp.us.debian.org wheezy/main Translation-en
 Fetched 189 B in 0s (275 B/s)
 Reading package lists... Done
 W: GPG error: http://snapshot.debian.org lenny Release: The following signatures were invalid: KEYEXPIRED 1246455239

Alguma ajuda?