## Confirming "bionic" is supported...
+ curl -sLf -o /dev/null 'https://deb.nodesource.com/node_14.x/dists/bionic/Release'
## Your distribution, identified as "bionic", is not currently supported, please contact NodeSource at https://github.com/nodesource/distributions/issues if you think this is incorrect or would like your distribution to be considered for support
use proxy to solve the problem