When ClamTK is installed, users are unable to upgrade the apache2-bin package, which depends on libcurl4, because the version of ClamAV in PureOS uses libcurl3. See all the details here:
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Maybe the same problem? --> https://tracker.pureos.net/T520
Someone said a similar description to my problem on your topic --> https://forums.puri.sm/t/cant-upgrade-apache2-bin/3379/6
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Yes, that Purism Forums entry was mine. I am having the same issue that you are having.