Troubleshooting Debian errors

[sudo] password for andrei: Ign:1 cdrom://[Debian GNU/Linux 10.4.0 _Buster_ - Official amd64 DVD Binary-1 20200509-10:26] buster InRelease Err:2 cdrom://[Debian GNU/Linux 10.4.0 _Buster_ - Official amd64 DVD Binary-1 20200509-10:26] buster Release Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs Err:3 http://deb.debian.org/debian buster InRelease Cannot initiate the connection to prod.debian.map.fastly.net:80 (2a04:4e42:14::204). - connect (101: Network is unreachable) Could not connect to prod.debian.map.fastly.net:80 (151.101.84.204), connection timed out Cannot initiate the connection to deb.debian.org:80 (2a04:4e42:14::645). - connect (101: Network is unreachable) Could not connect to deb.debian.org:80 (151.101.86.133), connection timed out Err:4 http://deb.debian.org/debian buster-updates InRelease Cannot initiate the connection to deb.debian.org:80 (2a04:4e42:14::645). - connect (101: Network is unreachable) Err:5 http://security.debian.org/debian-security buster/updates InRelease Cannot initiate the connection to prod.debian.map.fastly.net:80 (2a04:4e42:14::204). - connect (101: Network is unreachable) Could not connect to prod.debian.map.fastly.net:80 (151.101.84.204), connection timed out Cannot initiate the connection to security.debian.org:80 (2a04:4e42:c00::204). - connect (101: Network is unreachable) Cannot initiate the connection to security.debian.org:80 (2a04:4e42:200::204). - connect (101: Network is unreachable) Cannot initiate the connection to security.debian.org:80 (2a04:4e42:400::204). - connect (101: Network is unreachable) Cannot initiate the connection to security.debian.org:80 (2a04:4e42:a00::204). - connect (101: Network is unreachable) Cannot initiate the connection to security.debian.org:80 (2a04:4e42::204). - connect (101: Network is unreachable) Cannot initiate the connection to security.debian.org:80 (2a04:4e42:800::204). - connect (101: Network is unreachable) Cannot initiate the connection to security.debian.org:80 (2a04:4e42:600::204). - connect (101: Network is unreachable) Cannot initiate the connection to security.debian.org:80 (2a04:4e42:e00::204). - connect (101: Network is unreachable) Could not connect to security.debian.org:80 (151.101.0.204), connection timed out Could not connect to security.debian.org:80 (151.101.128.204), connection timed out Could not connect to security.debian.org:80 (151.101.192.204), connection timed out Could not connect to security.debian.org:80 (151.101.64.204), connection timed out Reading package lists... Done E: The repository 'cdrom://[Debian GNU/Linux 10.4.0 _Buster_ - Official amd64 DVD Binary-1 20200509-10:26] buster Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.

# deb cdrom:[Debian GNU/Linux 10.4.0 _Buster_ - Official amd64 DVD Binary-1 20200509-10:26]/ buster contrib main deb cdrom:[Debian GNU/Linux 10.4.0 _Buster_ - Official amd64 DVD Binary-1 20200509-10:26]/ buster contrib main deb http://deb.debian.org/debian/ buster main deb-src http://deb.debian.org/debian/ buster main deb http://security.debian.org/debian-security buster/updates main contrib deb-src http://security.debian.org/debian-security buster/updates main contrib # buster-updates, previously known as 'volatile' deb http://deb.debian.org/debian/ buster-updates main contrib deb-src http://deb.debian.org/debian/ buster-updates main contrib

[....] Restarting networking (via systemctl): networking.serviceJob for networking.service failed because the control process exited with error code. See "systemctl status networking.service" and "journalctl -xe" for details.

Setting up libnginx-mod-http-upstream-fair (1.14.2-2+deb10u1) ... Setting up nginx-full (1.14.2-2+deb10u1) ... Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details. invoke-rc.d: initscript nginx, action "start" failed. ● nginx.service - A high performance web server and a reverse proxy server Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Thu 2020-06-18 17:30:41 EEST; 12ms ago Docs: man:nginx(8) Process: 7196 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS) Process: 7198 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=1/FAILURE) Jun 18 17:30:39 debian nginx[7198]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) Jun 18 17:30:39 debian nginx[7198]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) Jun 18 17:30:40 debian nginx[7198]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) Jun 18 17:30:40 debian nginx[7198]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) Jun 18 17:30:40 debian nginx[7198]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) Jun 18 17:30:40 debian nginx[7198]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) Jun 18 17:30:41 debian nginx[7198]: nginx: [emerg] still could not bind() Jun 18 17:30:41 debian systemd[1]: nginx.service: Control process exited, code=exited, status=1/FAILURE Jun 18 17:30:41 debian systemd[1]: nginx.service: Failed with result 'exit-code'. Jun 18 17:30:41 debian systemd[1]: Failed to start A high performance web server and a reverse proxy server. dpkg: error processing package nginx-full (--configure): installed nginx-full package post-installation script subprocess returned error exit status 1 dpkg: dependency problems prevent configuration of nginx: nginx depends on nginx-full (<< 1.14.2-2+deb10u1.1~) | nginx-light (<< 1.14.2-2+deb10u1.1~) | nginx-extras (<< 1.14.2-2+deb10u1.1~); however: Package nginx-full is not configured yet. Package nginx-light is not installed. Package nginx-extras is not installed. nginx depends on nginx-full (>= 1.14.2-2+deb10u1) | nginx-light (>= 1.14.2-2+deb10u1) | nginx-extras (>= 1.14.2-2+deb10u1); however: Package nginx-full is not configured yet. Package nginx-light is not installed. Package nginx-extras is not installed. dpkg: error processing package nginx (--configure): dependency problems - leaving unconfigured Processing triggers for man-db (2.8.5-2) ... Processing triggers for systemd (241-7~deb10u4) ... Errors were encountered while processing: nginx-full nginx E: Sub-process /usr/bin/dpkg returned an error code (1)

● nginx.service - A high performance web server and a reverse proxy server Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Thu 2020-06-18 21:42:54 EEST; 5min ago Docs: man:nginx(8) Process: 15224 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS) Process: 15225 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=1/FAILURE)

-- Subject: A start job for unit nginx.service has begun execution -- Defined-By: systemd -- Support: https://www.debian.org/support -- -- A start job for unit nginx.service has begun execution. -- -- The job identifier is 2744. Jun 18 21:42:52 debian nginx[15225]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) Jun 18 21:42:52 debian nginx[15225]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) Jun 18 21:42:52 debian nginx[15225]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) Jun 18 21:42:52 debian nginx[15225]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) Jun 18 21:42:53 debian nginx[15225]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) Jun 18 21:42:53 debian nginx[15225]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) Jun 18 21:42:53 debian nginx[15225]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) Jun 18 21:42:53 debian nginx[15225]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) Jun 18 21:42:54 debian nginx[15225]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) Jun 18 21:42:54 debian nginx[15225]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use) Jun 18 21:42:54 debian nginx[15225]: nginx: [emerg] still could not bind() Jun 18 21:42:54 debian systemd[1]: nginx.service: Control process exited, code=exited, status=1/FAILURE -- Subject: Unit process exited -- Defined-By: systemd -- Support: https://www.debian.org/support -- -- An ExecStart= process belonging to unit nginx.service has exited. -- -- The process' exit code is 'exited' and its exit status is 1. Jun 18 21:42:54 debian systemd[1]: nginx.service: Failed with result 'exit-code'. -- Subject: Unit failed -- Defined-By: systemd -- Support: https://www.debian.org/support -- -- The unit nginx.service has entered the 'failed' state with result 'exit-code'. Jun 18 21:42:54 debian systemd[1]: Failed to start A high performance web server and a reverse proxy server. -- Subject: A start job for unit nginx.service has failed -- Defined-By: systemd -- Support: https://www.debian.org/support -- -- A start job for unit nginx.service has finished with a failure. -- -- The job identifier is 2744 and the job result is failed. Jun 18 21:43:08 debian sudo[8241]: pam_unix(sudo:session): session closed for user root Jun 18 21:48:12 debian PackageKit[8233]: daemon quit Jun 18 21:48:12 debian systemd[1]: packagekit.service: Main process exited, code=killed, status=15/TERM -- Subject: Unit process exited -- Defined-By: systemd -- Support: https://www.debian.org/support -- -- An ExecStart= process belonging to unit packagekit.service has exited. -- -- The process' exit code is 'killed' and its exit status is 15. Jun 18 21:48:12 debian systemd[1]: packagekit.service: Succeeded. -- Subject: Unit succeeded -- Defined-By: systemd -- Support: https://www.debian.org/support -- -- The unit packagekit.service has successfully entered the 'dead' state. Jun 18 21:50:45 debian sudo[19594]: andrei : TTY=pts/0 ; PWD=/home/andrei ; USER=root ; COMMAND=/usr/bin/journalctl -xe Jun 18 21:50:45 debian sudo[19594]: pam_unix(sudo:session): session opened for user root by andrei(uid=0)