Je ne pense pas que ce soit possible malheureusement. C’est quand meme bizarre que tu n’es pas réussi à instaler php5 via apt-get.
Tu utilise une sarge etch ou sid?
sudo apt-cache search php5
libapache-mod-php5 - server-side, HTML-embedded scripting language (apache 1.3 module)
libapache2-mod-php5 - server-side, HTML-embedded scripting language (apache 2.0 module)
php-image-canvas - Image_Canvas module for PEAR
php-image-graph - Image_Graph module for PEAR
php-pear - PEAR - PHP Extension and Application Repository
php4-pear - PHP Extension and Application Repository (transitional package)
php5 - server-side, HTML-embedded scripting language (meta-package)
php5-cgi - server-side, HTML-embedded scripting language (CGI binary)
php5-cli - command-line interpreter for the php5 scripting language
php5-common - Common files for packages built from the php5 source
php5-curl - CURL module for php5
php5-dev - Files for PHP5 module development
php5-gd - GD module for php5
php5-imap - IMAP module for php5
php5-json - JSON serialiser for PHP5
php5-ldap - LDAP module for php5
php5-mhash - MHASH module for php5
php5-mysql - MySQL module for php5
php5-odbc - ODBC module for php5
php5-pgsql - PostgreSQL module for php5
php5-recode - recode module for php5
php5-snmp - SNMP module for php5
php5-sqlite - SQLite module for php5
php5-sybase - Sybase / MS SQL Server module for php5
php5-uuid - OSSP uuid module for php5
php5-xmlrpc - XML-RPC module for php5
php5-xsl - XSL module for php5
php5-clamavlib - PHP ClamAV Lib - ClamAV Interface for PHP5 Scripts
php5-mapscript - module for php5-cgi to use mapserver