Error in restart Apache2 on Ubuntu server

hi, i can’t restart apache2. I tried to check the status whit

systemctl status apache2.service

and the response is

apache2.service - The Apache HTTP Server
   Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
  Drop-In: /lib/systemd/system/apache2.service.d
           └─apache2-systemd.conf
   Active: failed (Result: exit-code) since Thu 2021-01-07 17:37:34 UTC; 18min ago
  Process: 2022 ExecStart=/usr/sbin/apachectl start (code=exited, status=1/FAILURE)

Jan 07 17:37:34 wealdhy apachectl[2022]: AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
Jan 07 17:37:34 wealdhy apachectl[2022]: (98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
Jan 07 17:37:34 wealdhy apachectl[2022]: (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
Jan 07 17:37:34 wealdhy apachectl[2022]: no listening sockets available, shutting down
Jan 07 17:37:34 wealdhy apachectl[2022]: AH00015: Unable to open logs
Jan 07 17:37:34 wealdhy apachectl[2022]: Action 'start' failed.
Jan 07 17:37:34 wealdhy apachectl[2022]: The Apache error log may have more information.
Jan 07 17:37:34 wealdhy systemd[1]: apache2.service: Control process exited, code=exited status=1
Jan 07 17:37:34 wealdhy systemd[1]: apache2.service: Failed with result 'exit-code'.
Jan 07 17:37:34 wealdhy systemd[1]: Failed to start The Apache HTTP Server.

then i check the error log and found this

Jan 07 17:55:19 wealdhy sshd[2809]: Failed password for root from 36.152.38.149 port 55462 ssh2
Jan 07 17:55:19 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=212.91.113.201 DST=178.128.195.246 LEN=59 TOS=0x00 PREC=0x00 TTL=52 ID=7309 PROTO=UDP SPT=50744 DPT=53 LEN=39
Jan 07 17:55:19 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=212.91.113.201 DST=178.128.195.246 LEN=59 TOS=0x00 PREC=0x00 TTL=52 ID=7310 PROTO=UDP SPT=40505 DPT=53 LEN=39
Jan 07 17:55:20 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=212.91.113.201 DST=178.128.195.246 LEN=71 TOS=0x00 PREC=0x00 TTL=52 ID=7696 PROTO=UDP SPT=55060 DPT=53 LEN=51
Jan 07 17:55:20 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=212.91.113.201 DST=178.128.195.246 LEN=71 TOS=0x00 PREC=0x00 TTL=53 ID=7698 PROTO=UDP SPT=58932 DPT=53 LEN=51
Jan 07 17:55:20 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=212.91.113.200 DST=178.128.195.246 LEN=71 TOS=0x00 PREC=0x00 TTL=52 ID=58001 PROTO=UDP SPT=41859 DPT=53 LEN=51
Jan 07 17:55:38 wealdhy sshd[2818]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.153.37.194  user=root
Jan 07 17:55:39 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=212.91.113.208 DST=178.128.195.246 LEN=71 TOS=0x00 PREC=0x00 TTL=52 ID=2213 PROTO=UDP SPT=40031 DPT=53 LEN=51
Jan 07 17:55:41 wealdhy sshd[2818]: Failed password for root from 202.153.37.194 port 43646 ssh2
Jan 07 17:55:41 wealdhy sshd[2818]: Received disconnect from 202.153.37.194 port 43646:11: Bye Bye [preauth]
Jan 07 17:55:41 wealdhy sshd[2818]: Disconnected from authenticating user root 202.153.37.194 port 43646 [preauth]
Jan 07 17:55:46 wealdhy sshd[2822]: Invalid user halt from 185.156.74.65 port 12420
Jan 07 17:55:46 wealdhy sshd[2822]: pam_unix(sshd:auth): check pass; user unknown
Jan 07 17:55:46 wealdhy sshd[2822]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=185.156.74.65
Jan 07 17:55:48 wealdhy sshd[2822]: Failed password for invalid user halt from 185.156.74.65 port 12420 ssh2
Jan 07 17:55:48 wealdhy sshd[2822]: Connection closed by invalid user halt 185.156.74.65 port 12420 [preauth]
Jan 07 17:55:55 wealdhy sshd[2824]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.162.235.166  user=root
Jan 07 17:55:57 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=45.146.167.16 DST=178.128.195.246 LEN=40 TOS=0x00 PREC=0x00 TTL=249 ID=38497 PROTO=TCP SPT=48688 DPT=63398 WINDOW=1024 RES=0x00 SYN URGP=0
Jan 07 17:55:57 wealdhy sshd[2824]: Failed password for root from 121.162.235.166 port 37972 ssh2
Jan 07 17:56:10 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=79.124.62.110 DST=178.128.195.246 LEN=40 TOS=0x00 PREC=0x00 TTL=248 ID=41381 PROTO=TCP SPT=55452 DPT=40293 WINDOW=1024 RES=0x00 SYN URGP=0
Jan 07 17:56:12 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=79.124.62.110 DST=178.128.195.246 LEN=40 TOS=0x00 PREC=0x00 TTL=248 ID=30390 PROTO=TCP SPT=55452 DPT=33964 WINDOW=1024 RES=0x00 SYN URGP=0
Jan 07 17:56:14 wealdhy kernel: [UFW BLOCK] IN=eth0 OUT= MAC=ca:7c:d5:fc:c6:f1:fe:00:00:00:01:01:08:00 SRC=195.54.161.151 DST=178.128.195.246 LEN=40 TOS=0x00 PREC=0x00 TTL=249 ID=32546 PROTO=TCP SPT=48798 DPT=45629 WINDOW=1024 RES=0x00 SYN URGP=0
Jan 07 17:56:21 wealdhy sshd[2831]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.77.201.36  user=root
Jan 07 17:56:24 wealdhy sshd[2831]: Failed password for root from 51.77.201.36 port 37568 ssh2
Jan 07 17:56:24 wealdhy sshd[2831]: Received disconnect from 51.77.201.36 port 37568:11: Bye Bye [preauth]
Jan 07 17:56:24 wealdhy sshd[2831]: Disconnected from authenticating user root 51.77.201.36 port 37568 [preauth]

Before today everything was fine.

Anyone have any idea what that means (and how i can fix it) ?

Thanks in advance Francesco