Check old driver and unload it.
rmmod r8168
Build the module and install
At main.c:160:
- SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:69
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:76
sign-file: certs/signing_key.pem: No such file or directory
Warning: modules_install: missing 'System.map' file. Skipping depmod.
DEPMOD 5.11.0-25-generic
load module r8168
Updating initramfs. Please wait.
update-initramfs: Generating /boot/initrd.img-5.11.0-25-generic
Completed.