Problem upgrading after trying to install wireguard in Devuan Chinera

Trying to install wireguard / wireguard-tools on a Raspberry Pi3b running Devuan Chimaera. Get blocked in generating the system images --- see below: dpkg: error processing package linux-image-rt-arm64 (--configure): dependency problems - leaving unconfigured Errors were encountered while processing: linux-image-5.10.0-27-rt-arm64 linux-image-rt-arm64 E: Sub-process /usr/bin/dpkg returned an error code (1) root@there:~# dpkg --configure linux-image-5.10.0-27-rt-arm64 Setting up linux-image-5.10.0-27-rt-arm64 (5.10.205-2) ... /etc/kernel/postinst.d/dkms: dkms: running auto installation service for kernel 5.10.0-27-rt-arm64:. /etc/kernel/postinst.d/initramfs-tools: update-initramfs: Generating /boot/initrd.img-5.10.0-27-rt-arm64 Creating initrd.gz. cp: target '/boot/initrd.gz': No such file or directory run-parts: /etc/initramfs/post-update.d//99-initrd exited with return code 1 run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1 dpkg: error processing package linux-image-5.10.0-27-rt-arm64 (--configure): installed linux-image-5.10.0-27-rt-arm64 package post-installation script subprocess returned error exit status 1 Errors were encountered while processing: linux-image-5.10.0-27-rt-arm64 --- This after several runs through, tried after using apt-get satisfy, or dpkg --configure. I end up with the trace above or similar - but always failing to build linux-image-5.10.0-27-rt-arm64 I eventually will just rebuild but I'd hate to have to reinstall all the stuff on that little box :-( Thanks!