All defaults so it was standard install. did not do anything more, booted without interacting with IPL.Then this is extremely strange and unexpected. There must be a hppa-specific hack in one of the installer components which breaks this. At which step are you seeing the error message regarding Buster? Does it install the base system? Does it show up after asking for the mirror to install extra components?
It happens during "Download installer components", before detecting the disks etc.
The keyrings files: # find / -name '*gpg*'You should look under /target, not in the installer's chroot.
There is no /target yet.
What keyring should contain the debian-ports key and how should it get to the installer image?The proper keyring is "debian-ports-archive-keyring".
This package contains the followwing keyring files: /usr/share/keyrings/debian-ports-archive-keyring-removed.gpg /usr/share/keyrings/debian-ports-archive-keyring.gpg They seem to be missing from the installer initramfs: ~ # ls -l /usr/share/keyrings/ lrwxrwxrwx 1 root root 26 Apr 12 13:16 archive.gpg -> debian-archive-keyring.gpg -rw-r--r-- 1 root root 5106 Oct 28 17:22 debian-archive-jessie-automatic.gpg -rw-r--r-- 1 root root 5115 Oct 28 17:22 debian-archive-jessie-security-automatic.gpg -rw-r--r-- 1 root root 2763 Oct 28 17:22 debian-archive-jessie-stable.gpg -rw-r--r-- 1 root root 30142 Oct 28 17:22 debian-archive-keyring.gpg -rw-r--r-- 1 root root 7443 Oct 28 17:22 debian-archive-stretch-automatic.gpg -rw-r--r-- 1 root root 7452 Oct 28 17:22 debian-archive-stretch-security-automatic.gpg -rw-r--r-- 1 root root 2263 Oct 28 17:22 debian-archive-stretch-stable.gpg -- Meelis Roos