on linux 4.19, I get
error creating new backup file '/var/lib/dpkg/status-old': Invalid cross-device link
when trying to install stuff on a ubuntu docker container. this seems to be an issue with metacopy https://www.spinics.net/lists/linux-unionfs/msg06109.html
issue can be worked around by running
echo N | sudo tee /sys/module/overlay/parameters/metacopy
👍