estou tentando instalar o servidor apache e mysql no ubuntu 16

Question

por favor, alguém pode me dizer por que meu terminal está mostrando:

root@prince-HP-ProBook-6470b:~# apt-get install mysql-server mysql-client
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  galera-3 iproute libdbd-mysql-perl libdbi-perl libjemalloc1
  libmariadbclient18 libmysqlclient18 libreadline5 mariadb-common socat
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  mysql-server-5.7
Suggested packages:
  mailx tinyca
The following NEW packages will be installed:
  mysql-client mysql-server mysql-server-5.7
0 upgraded, 3 newly installed, 0 to remove and 4 not upgraded.
Need to get 0 B/2,592 kB of archives.
After this operation, 48.6 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Preconfiguring packages ...
(Reading database ... 189575 files and directories currently installed.)
Preparing to unpack .../mysql-server-5.7_5.7.15-0ubuntu0.16.04.1_amd64.deb ...
Aborting downgrade from (at least) 10.1 to 5.7.
If are sure you want to downgrade to 5.7, remove the file
/var/lib/mysql/debian-*.flag and try installing again.
dpkg: error processing archive /var/cache/apt/archives/mysql-server-5.7_5.7.15-0ubuntu0.16.04.1_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
Selecting previously unselected package mysql-client.
Preparing to unpack .../mysql-client_5.7.15-0ubuntu0.16.04.1_all.deb ...
Unpacking mysql-client (5.7.15-0ubuntu0.16.04.1) ...
Selecting previously unselected package mysql-server.
Preparing to unpack .../mysql-server_5.7.15-0ubuntu0.16.04.1_all.deb ...
Unpacking mysql-server (5.7.15-0ubuntu0.16.04.1) ...
Errors were encountered while processing:
 /var/cache/apt/archives/mysql-server-5.7_5.7.15-0ubuntu0.16.04.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@prince-HP-ProBook-6470b:~# systemctl start apache2
root@prince-HP-ProBook-6470b:~# apt-get purge apache2
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 mysql-server : Depends: mysql-server-5.7 but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

    

Answer 1

 sudo apt-get autoclean

remova o arquivo sources.list e crie novas sources.list ...

sudo rm /etc/apt/sources.list 

Em seguida, digite

sudo software-properties-gtk 

Isto irá abrir o software-properties-gtk e um newsources.list será criado automaticamente.

Em seguida, altere o servidor para US ou para qualquer outro servidor de sua escolha. Você deve ativar os repositórios a partir do novo diálogo para criar novas sources.list.

Marque todas as caixas, clique em Reverter e, em seguida, clique em fechar.

Precisa restaurar repositórios padrão

 sudo apt-get update && sudo apt-get dist-upgrade -y

(é uma boa prática fazer backup desse arquivo antes de instalar para recuperar se isso acontecer)

Agora instale qualquer coisa!

    

Answer 2

Bem, este op mostra que, você instalou o mariadb antes disso e está instalando o servidor mysql agora, o que parece causar esse problema. Melhor remover mariadb, mysql-server e apache e limpar o cache e tentar reinstalar o mysql-server e o apache.

Remova o mariadb.

sudo apt-get remove --purge mariadb-*

Remova o mysql-server e o apache2 se instalado.

sudo apt-get remove --purge mysql-server apache2

Remova as dependências indesejadas e limpe-as.

 sudo apt-get autoremove
 sudo apt-get autoclean

Agora vá instalando um por um.
Nota: Não instale o mariadb e o mysql-server porque o fromer é um fork do último e ambos atendem ao mesmo propósito.