one possible solution is to add this repo if you do not already have access to the package, as mentioned in the link:

You should be able to use any of the listed mirrors by adding a line to your /etc/apt/sources.list like this:

deb http://security.ubuntu.com/ubuntu jammy-security main

then you should be able to install the missing package:

Copysudo apt update
sudo apt install libc6

Ubuntu uses the Debian packaging format, and so you cannot sensibly install RPMs on a Deb based distribution. While it is possible to install the rpm tool, the package dependencies don't integrate with those of Deb packages, and the contents of packages may not necessarily work either.

The best solution is to find a Deb package of the software you want, and the next best option is to build it into a Deb package yourself (which is a fair amount of work). If those are not possible, the last resort is to try using alien to convert the RPM into a Deb. You will still need to deal with the dependencies manually, and possible with changes done in package scripts.

I've got this error with buildroot-2022.11 when executing make.

Ubuntu 20.04 - added this repo as described in the link

sudo apt update
sudo apt install libc6

It automatically installed 2.35 for me.

That means the program was compiled against glibc version 2.14, and it requires that version to run, but your system has an older version installed. You'll need to either recompile the program against the version of glibc that's on your system, or install a newer version of glibc (the "libc6" package in Debian).

Debian has glibc 2.16 in the "experimental" repository, but recompiling the program is the safer option. Glibc is the library that everything depends on, so upgrading it can have far-reaching implications. Although there's probably nothing wrong with Debian's glibc 2.16 package, the fact that it's in the experimental repository means it hasn't received as much testing.

ITs works for me when i avoid /target directory and now working both version of ubuntu 20.04 and 21.10. Giving thanks to @Charles Duffy and @Herohtar for their important and useful instruction,

CopyFROM ubuntu:21.10
RUN apt-get update && apt-get upgrade -y
RUN apt-get install libssl-dev

RUN apt-get install -y -q build-essential curl
RUN curl https://sh.rustup.rs -sSf | sh -s -- -y
ENV PATH="/root/.cargo/bin:${PATH}"

WORKDIR /command-agent
COPY ./src/. /command-agent/src/
COPY .env /command-agent/
COPY Cargo.toml /command-agent/
COPY Cargo.lock /command-agent/
RUN cargo build --release

EXPOSE 8080
ENTRYPOINT /command-agent/target/release/command-agent