The first one gives me an unbootable system

$ ldd /sbin/init | grep /usr
        libpcre2-8.so.0 => /usr/lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007f737ba28000)

fortunately /bin/bash didn't depend on /usr so I could boot with
init=/bin/bash, but there is more breakage:

$ ldd /bin/mount | grep /usr
        libmount.so.1 => /usr/lib/x86_64-linux-gnu/libmount.so.1 (0x00007f5bc9b06000)
        libblkid.so.1 => /usr/lib/x86_64-linux-gnu/libblkid.so.1 (0x00007f5bc98f0000)
        libpcre2-8.so.0 => /usr/lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007f5bc982c000)

$ dpkg -l | grep sysvinit-core
ii  sysvinit-core                        2.96-7+devuan1                         amd64        System-V-like init
$ dpkg -l | grep mount
ii  libmount1:amd64                      2.36.1-8+devuan1                       amd64        device mounting library
ii  mount                                2.36.1-8+devuan1                       amd64        tools for mounting and manipulating filesystems

Soo, what can I do to help with that ?

Regards,
/Karl Hammar