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docs: rewrite speculative Dockerfile snippet with apt-cache discovery step

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Co-authored-by: Theaxiom <57013+Theaxiom@users.noreply.github.com>
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2026-05-20 03:51:28 +00:00
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co-authored by Theaxiom
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@@ -679,19 +679,27 @@ When building baseimage-docker from source, you can set `INSTALL_GNU_COREUTILS=1
docker build --build-arg BASE_IMAGE=ubuntu:26.04 --build-arg INSTALL_GNU_COREUTILS=1 image/
```
Alternatively, you can install GNU Coreutils in your own Dockerfile that derives from a 26.04-based baseimage:
Alternatively, you can install GNU Coreutils in your own Dockerfile that derives from a 26.04-based baseimage. Because Ubuntu 26.04 packaging is not yet finalised, first discover the correct package names:
```bash
# Discover available GNU coreutils and traditional sudo packages on Ubuntu 26.04:
docker run --rm ubuntu:26.04 sh -c \
'apt-get update -qq && apt-cache search coreutils && apt-cache search sudo | grep -i traditional'
```
Once you have confirmed the actual package names, install them in your Dockerfile:
```Dockerfile
FROM phusion/baseimage:<ubuntu-26.04-version>
# Replace uutils-coreutils with GNU Coreutils and sudo-rs with traditional sudo.
# Substitute <gnu-coreutils-pkg> and <traditional-sudo-pkg> with the actual
# package names found via 'apt-cache search' on Ubuntu 26.04 above.
RUN apt-get update && \
apt-get install -y --no-install-recommends coreutils-gnu sudo-traditional && \
apt-get install -y --no-install-recommends <gnu-coreutils-pkg> <traditional-sudo-pkg> && \
apt-get clean && rm -rf /var/lib/apt/lists/*
```
> **Note:** The exact replacement package names (`coreutils-gnu`, `sudo-traditional`) may vary. Run `apt-cache search coreutils` and `apt-cache search sudo` inside an Ubuntu 26.04 container to discover the available alternatives.
<a name="conclusion"></a>
## Conclusion