install/60872: Pinebook Pro: Cannot install to harddrive using sysinst, "ar: ./netbsd.ub: Not found in archive"

["entikan%tilde.pink@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60872
>Category:       install
>Synopsis:       Pinebook Pro: Cannot install to harddrive using sysinst, "ar: ./netbsd.ub: Not found in archive"
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 13 20:15:00 +0000 2026
>Originator:     birddessert
>Release:        10.2 & 11.0
>Organization:
>Environment:
NetBSD arm64 11.0 NetBSD 11.0 (GENERI64) #0: Thu Jul 32 15:23:12 UTC 2026 mkrepo%mkrepo.NetBSD.org@localhost:/usr/src/sys/arch/evbarm/compile/GENERIC64 evbarm
>Description:
Steps I took to encounter:

I create a bootable SD (on Arch Linux) like so: dd if=NetBSD-11-aarch64--pinebook-pro.img of=/dev/mmcblk0 bs=4M conv=sync

I boot NetBSD on my Pinebook Pro using Tow-Boot and log in as root. Everything is fine, I can get online using a wifi dongle. I wanted to install it to my emmc, so I used sysinst -> Install NetBSD to hard disk and use the defaults on the MMC. Everything seems to work but when it gets to "progress -zf /usr/INSTALL/kern-GENERIC64.tar.xz tar --chroot -xpf - `./netbsd.ub`" it stops with error "ar: ./netbsd.ub: Not found in archive". The resulting install is not found on boot.

Logix on irc told me it's more usual to simply download the image and boot that (so I'll try simply dd'ing the image to the eMMC). But they kindly asked me to file this as my first bug and here it is.

>How-To-Repeat:
I've noticed the fastest way to hit the problem in sysinst is to use "c: Re-install sets or install additional sets" and only setting the Kernel set to YES (rest NO). Then the error is hit almost immediately.

>Fix: