The following packages have unmet dependencies: frr : Depends: (>= 0.11) but it is not installable Depends: libreadline7 (>= 6.0) but it is not installable Recommends: frr-pythontools but it is not going to be installed E: Unable to correct problems, you have held broken packages.
root@ubuntu:~# uname -a Linux ubuntu 5.3.0-18-generic #19-Ubuntu SMP Tue Oct 8 20:14:34 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux root@ubuntu:~# cat /etc/os-release NAME="Ubuntu" VERSION="19.10 (Eoan Ermine)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 19.10" VERSION_ID="19.10" HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" VERSION_CODENAME=eoan UBUNTU_CODENAME=eoan root@ubuntu:~#
原文：https://www.cnblogs.com/dream397/p/13340761.html