Não é possível instalar o Nginx no meu Ubuntu 18.04.3

Não é possível instalar o Nginx no meu Ubuntu 18.04.3

Sou iniciante na configuração de servidores e não consigo instalar o nginx no meu servidor Ubuntu 18.04.3 (LTS) x64 da Digitalocean. Tentei ler outras entradas, mas nenhuma das soluções parece funcionar para mim. Tentei desinstalar e reinstalar, mas sempre recebo a mesma resposta.

sudo apt-get install nginx
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:
 nginx : Depends: nginx-core (< 1.14.0-0ubuntu1.7.1~) but it is not going to be installed or
                  nginx-full (< 1.14.0-0ubuntu1.7.1~) but it is not going to be installed or
                  nginx-light (< 1.14.0-0ubuntu1.7.1~) but it is not going to be installed or
                  nginx-extras (< 1.14.0-0ubuntu1.7.1~) but it is not going to be installed
         Depends: nginx-core (>= 1.14.0-0ubuntu1.7) but it is not going to be installed or
                  nginx-full (>= 1.14.0-0ubuntu1.7) but it is not going to be installed or
                  nginx-light (>= 1.14.0-0ubuntu1.7) but it is not going to be installed or
                  nginx-extras (>= 1.14.0-0ubuntu1.7) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Qualquer ajuda seria muito apreciada!

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