После этого должно заработать:
root@2527598ab7ae:/# systemctl enable manticore
Synchronizing state of manticore.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable manticore
Failed to enable unit: Unit /run/systemd/generator.early/manticore.service is transient or generated.
root@2527598ab7ae:/# rm /lib/systemd/system-generators/manticore-generator
root@2527598ab7ae:/# systemctl enable manticore
Synchronizing state of manticore.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable manticore
Created symlink /etc/systemd/system/manticore.service -> /lib/systemd/system/manticore.service.
Created symlink /etc/systemd/system/searchd.service -> /lib/systemd/system/manticore.service.
Created symlink /etc/systemd/system/multi-user.target.wants/manticore.service -> /lib/systemd/system/manticore.service.
Здравствуйте. Проблема и решение, озвеченные выше, до сих пор актуальны.
Ubuntu 20.04.2 LTS (GNU/Linux 5.4.0-72-generic x86_64
Manticore 3.6.0 96d61d8bf@210504 release (columnar 1.0.0 768b007@210503)