Dear Maintainer,

To discover PPPoE concentrators, the postinst script of ppp-udeb uses
pppoe-discovery in line 34:

  ( R=$(pppoe-discovery -A $P -I $1 2>/tmp/ppp-errors | \

According to the manual page the -A option is no longer available (at
least in Bullseye, in Buster it was still present).

Therefore each attempt to discover the PPPoE concentrator fails and
is considered as a timeout which breaks the use of dial-up
connections in the installer.

According the manual page shipped with past Debian versions, the -A option
had no effect at all and was only accepted for compatiblity with the pppoe
command.

Since the package is completely unusable in the current state,
backporting the bug fix to stable would be very helpful.

Kind regards,
Felix Jacobi