here is photo of df -h etc.

this box is dual booting openbsd 6.6 and xubuntu 18.04. i dont know what to do, give me hint to right direction and i try to do it myself.

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How many packages do you have installed? You might split out /usr/local/ into its own partition and leave /usr/ for base.

i installed xfce desktop and couple of progs like geany, conky.

make /usr partition bigger by shrinking c or e, not sure what c is or as suggested move /usr/local/ to its own partition.

c is a marker for the total capacity. It won't be used directly except for operations which affect/ wipe the whole disk. So trimming e, /home/, is probably the best option. Shrinking will mean backing up that partition and then erasing it. Depending on the geometry you might be able to grow /usr/ or add /usr/local/ but if you have the possiblity, I'd reinstall and make a separate /usr/local/ in the process.

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What purpose is partition f serving? It's also formatted to 4.2BSD, but nothing is mounted there? It seems to around half the disk...

i made some kind of mistake and got "loading err m" warning when booting.
i gave up and now have just xubuntu bridge, ill try later to dual boot bsd and buntu.

thanks to all that replied.

https://man.openbsd.org/biosboot.8

Moving / resizing partitions is a possible cause. Re-running installboot(8) usually solves this kind of thing.

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It's a problem caused by a change in the physical location of the file /boot, the second stage bootloader. Caused either by moving/deleting the file or by moving/resizing the root partition resulting in a changed location. The error message is issued by the first stage bootloader, stating that it did not find the second stage where expected.

As noted, installboot(8) will fix the problem. The installboot program is available to the admin while using the RAMDISK kernel, so booting installation media and requesting the (S)hell provides access to the program. The 2 stages -- biosboot and boot, respectively -- are already installed in /usr/mdec, or may be manually extracted from the baseXY fileset. I find mounting /usr easier.

Here's an example of the steps I take from the RAMDISK shell when I make this error. Every time I make it. In this example, the disk I damaged is "sd0" and I discover /usr is partition "e" when I read the fstab(5) output:

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thanks for the info.
that BSD box wasnt important, but thanks to you two.

I will most of the time select [a] to auto-generate partition sizes when I install OpenBSD. On occasion I will select [c] and customize the partition sizes and manually enter the partition names and the size of each partition.