Citadel? Courier? Cyrus? Dovecot? - I just want to backup my emails

Yes, and now I try to install the GNU Mailutils source package on a Pi3B with Bullseye OS. Meaning, try to rebuild the (ancient) package as is, and as next steps, to replace the source tgz, do some adaptations and try to get this built, also.

By some reason, Synaptic install GUI does only show the sources for a few packages, and Mailutils is not among them.

/etc/apt/sources.list contains

deb

Is there one more repo to activate, so that it shows up for downloading?

Thank you!

bullseye’s mailutils is ancient because bullseye is ancient, two full releases out of date. If you need recent software then upgrade to trixie (mailutils 3.19).

Synaptic doesn’t provide source packages, you use ‘apt-get source’ for that.

^^^^^^^^^^^^^^

I'd just build from the latest source code manually like you did on Mageia, but whatever floats your boat...

As a guess: maybe the Raspbian package repo doesn't have sources for packages they copied from Debian instead of rebuilding themselves? You could look at the Debian package info/downloads on the web like LDO suggested. I'm not sure how building from sources automatically via Apt works, so I'm not sure how you'd use the Debian package repo with that.

My mistake, he linked to the location on the Raspbian mirror, here's what I meant:

Raspbian doesn't copy packages from Debian, it just uses the Debian repos. The Raspberry Pi's own repo doesn't contain userspace packages unless they're pi-specific.

The issue is probably that /etc/apt/sources.list only has a line for "deb" packages and not "deb-src" packages, by default.

Such a line is easy to add.

(If the OP were using Trixie it would be a matter of adding "deb-src" after "deb" on the line starting "Types:" in /etc/apt/sources.list.d/debian.sources).

I just modified the list of sources in /etc/apt/sources.list and /etc/apt/ sources.list.d/debian.sources and tried to upgrade from bullseye to trixie directly, but this failed. Maybe this was not a good idea.

At least the machine boots and runs properly, but no further update possible. - Is there a way to revert back and first upgrade to bookworm and then to trixie, or is the only proper solution to set up a new install?

Thanks!

This is evidently untrue simply from looking at the Raspbian repo's contents. I found out the hard way that some packages like Firefox there are built only for Debian's target ARM architectures, not the early Raspberry Pi boards.

Also I haven't seen the Debian repo used in Raspbian sources.list, though I haven't used the more recent RPi OS versions. Would this even work seeing as there'd be conflicting packages for the same programs? In my experience with Debian on PC, it wouldn't since Apt doesn't favour one repo over another - it just selects whichever package versions look latest.

He posted that there was a "deb-src" line already.

Anyway it still won't build him the latest Mailutils which would be easy to do the same way he already did it on PC (providing the dependency package names are changed to Debian ones), so I think I give up at this point.

It uses both debian.org (or mirrors thereof) and raspberrypi.org. The latter has RPi-specific packages (e.g. raspi-config) and RPi-specific rebuilds of standard packages (e.g. vlc), but excludes packages where the binaries are shared with Debian (e.g. coreutils).

It works fine...

The answer was clear from the original post: OP didn’t know how to get source packages.

I suppose it depends what you mean by pi-specific. Yes, there are builds of some userspace applications in the pi repo (more than I realized, I admit).

The debian.sources file in Trixie looks identical on my AMD64 box and my Pi5. I don't have Bullseye installs around, any more, to check.

apt is complex. It uses version numbers, priorities, pinning, and preferences from /etc/apt -- it does seem to work, but I haven't worked out exactly how.

OK, maybe the sources.list has changed in newer versions, but coreutils _is_ there the RPi repo, and updated in 2025:

They did better than the developers of AntiX then, where Aptitude would keep selecting Systemd-dependent packages from the Debian repo when they were updated to a newer version than the Sysv ones in the AntiX repo. I couldn't find any settings to prevent that so I switched to Devuan which has its own separate repo for all packages, though most are probably the same as the Debian packages. I thought it worked like that in RPi OS as well, but I've switched away from that now.

OP won't get source packages for the newer Mailutils version he wants that way, just the old version used for the package, which he's not happy with. But OP already has the sources he used for building the latest version on PC, minus the Debian patches (which might not work on the latest version anyway).

$ curl -s

I’m not clear why it has to be a specific version anyway...

That appears to be something different. Trying the same thing with the raspbian.raspberrypi.org site the OP is using in their sources.list as they posted earlier:

$ wget

(yes I know you can use pipes there too, I don't like wasting data and time if I want to run another grep)

They don't seem to have 64bit packages at raspbian.raspberrypi.org, so I guess 64bit installs use "archive" or something else.