after rebooting grub report an error

GRUB-loading
Welcome to GRUB!
error: symbol 'grub_verfy_string' not found
grub rescue>

try to boot manualy:

grub rescue> ls (hd0,1)/
./ ../ lost+found/ opt/ etc/ tmp/ vmlinuz /boot /bin ...

grub rescue> set root=(hd0,1)
grub rescue> set prefix=(hd0,1)/boot/grub
grub rescue> insmod normal
error: symbol 'grub_verfy_string' not found
grub rescue>
-------------------------
# dpkg --list grub* linux-image*
Desired=Unknown/Install/Remove/Purge/Hold
|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name             Version      Architecture Description
+++-================-============-============-=====================================================
ii  grub-common      2.04-16      i386         GRand Unified Bootloader
(common files)
ii  grub-pc          2.04-16      i386         GRand Unified Bootloader,
version 2 (PC/BIOS version)
ii  grub-pc-bin      2.04-16      i386         GRand Unified Bootloader,
version 2 (PC/BIOS modules)
ii  grub2-common     2.04-16      i386         GRand Unified Bootloader
(common files for version 2)
ii  linux-image-5.10.0-4-686-pae          5.10.19-1    i386         Linux
5.10 for modern PCs (signed)
ii  libc6:i386                        2.31-9                       i386
GNU C Library: Shared libraries

The GRUB packaging is almost certainly configured to install GRUB to the
wrong place, i.e. not the place from which your firmware actually boots.
I suggest running "sudo dpkg-reconfigure grub-pc" and fixing its
configuration in whatever way is appropriate to your system.

indeed this was a configuration problem.

while repeating: "dpkg-reconfigure grub-pc" the misconfiguration happened
at the decition where to write grub to. either into the partition of
rootfs or outside into raw-dev. which was the correct one.

thank you giving me the tipp - system is booting now perfectly
carsten :)