Ubuntu linux comes with vnstat installed.
Just type
vnstat
You will get following output.
rx / tx / total / estimated
enp5s0: Not enough data available yet.
enp4s0:
Jun '19 61.09 GiB / 1.80 GiB / 62.88 GiB
Jul '19 4.96 GiB / 173.10 MiB / 5.13 GiB / 96.49 GiB
yesterday 3.31 GiB / 134.80 MiB / 3.44 GiB
today 1.65 GiB / 38.30 MiB / 1.69 GiB / 2.61 GiB
To know more on how to use this command, type
man vnstat
