About the rtc, I figured it out, with some internet digging.
Looking at the bash script
here
, I executed it but failed to start service because the i2c bus must be enabled before.To do that, add these 2 lines in the files /boot/config.txt
dtparam=i2c_arm=on
dtoverlay=i2c-rtc,ds3231
Reboot the pi and execute the bash script you downloaded with sudo permission. The rtc should now work.