When run from a process container, `snapcraft` could fail, because `apt-get` caches are not up to date. https://cirrus-ci.com/task/4766182000820224 The solution is to update the cache if it is too old. There are feature requests for that in `apt`. https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1429285 https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1709603 Some solutions were proposed on StackExchange. https://unix.stackexchange.com/questions/271000/update-apt-get-cache-only-if-its-older-than-certain-time?rq=1