installa anche il -devel di apt
poi al limite controlla in apt-conf

mi ricordo che con un tipo di apt per suse avevo settatto da li di non controllare la sign dei pacchetti

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oppure
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Public gpg keys for apt components

Most public gpg keys are delivered via rpms prefixed with rpmkey-. Those rpms are part of the apt repository and just like other rpms they can be installed with apt. The rpmkey rpms are provided via the component rpmkey, it is therefor adviced to add the component rpmkey to your sources.list file. Apt (version 0.15.5cnc6*rb5 and beyond (suse 9.0 and beyond)) will take care that the public gpg key is automatically imported into the rpm database! The second part of the 'public gpg key rpm' name is in most cases the name of apt component. There are for example; rpmkey-packman, rpmkey-suser-scorot, etc. Just use apt search rpmkey to find the available public gpg key rpms. After the desired rpmkey rpm has been found use: apt --no-checksig --no-post install <desired rpmkey rpm> to obtain the public gpg key.

Non apt users can install rpmkey- rpms too. They only need to import the public gpg key being delivered with the rpm manually into the rpm database with the command: rpm --import <public gpg key file>. The rpmkey rpms are hosted on gwdg.de
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con questo apt non chiede la sign perche se la scarica da solo
ftp://ftp.uni-erlangen.de/pub/Linux/...kages/SuSE-9.1