Package: python-certbot Version: 0.9.3-1~bpo8+1 Severity: normal Trying to install python-certbot (really letsencrypt), running into two dependency issues, one with python-certbot itself and the other with an indirect dependency python-acme has.
p-c depends on a newer version of python-cryptography than is available, and depends on python-acme which depends on a newer version of python-openssl than is available. $ sudo apt install python-certbot python-acme Reading package lists... Done Building dependency tree Reading state information... Done 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: python-acme : Depends: python-openssl (>= 0.15) but 0.14-1 is to be installed Depends: python-cryptography (>= 0.8) but 0.6.1-1 is to be installed Depends: python-setuptools (>= 11.3~) but 5.5.1-1 is to be installed Recommends: python-dnspython but it is not going to be installed python-certbot : Depends: python-cryptography (>= 0.7) but 0.6.1-1 is to be installed Recommends: letsencrypt Recommends: python-psutil (>= 2.2.1) but it is not going to be installed E: Unable to correct problems, you have held broken packages. -- System Information: Debian Release: 8.6 APT prefers stable APT policy: (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.8.0-1-amd64 (SMP w/8 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system)