Openethereum 3.1rc1 fails - GLIBC_2.29 not found

• OpenEthereum version: 3.1RC1
• Operating system: Linux (Ubuntu 18.04)
• Installation: Got the linux zip from https://github.com/openethereum/backport-3.1/releases/tag/v3.1.0-rc.1
• Fully synchronized: no
• Network: ...
• Restarted: yes

I just downloaded the RC version, unzipped the zip, did chmod +x openethereum and when I run openethereum --help I get the following:

openethereum-3.1RC1: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by openethereum-3.1RC1)
openethereum-3.1RC1: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by openethereum-3.1RC1)

After looking for a few minutes about it on the internet, I am not sure whether the problems comes from my side or your side, so here I post.

Never had such an issue with previous openethereum / parity versions.