The build for Qurator_CuriousFacts suddenly became problematic.
libcurl4-openssl-dev conflicts with libcurl4-gnutls-dev:
sudo apt-get install -y git-core libcairo2-dev libcurl4-openssl-dev libgit2-dev libicu-dev libssl-dev libxml2-dev Reading package lists... Done Building dependency tree Reading state information... Done Note, selecting 'git' instead of 'git-core' git is already the newest version (1:2.17.1-1ubuntu0.8). git set to manually installed. libcairo2-dev is already the newest version (1.15.10-2ubuntu0.1). libcairo2-dev set to manually installed. libicu-dev is already the newest version (60.2-3ubuntu3.1). libicu-dev set to manually installed. libssl-dev is already the newest version (1.1.1-1ubuntu2.1~18.04.9). libxml2-dev is already the newest version (2.9.4+dfsg1-6.1ubuntu1.3). libgit2-dev is already the newest version (0.26.0+dfsg.1-1.1ubuntu0.2). Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libcurl4-gnutls-dev : Conflicts: libcurl4-openssl-dev but 7.58.0-2ubuntu3.13 is to be installed libcurl4-openssl-dev : Conflicts: libcurl4-gnutls-dev but 7.58.0-2ubuntu3.13 is to be installed E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.