Solution for SSH connection on Ubuntu system within LAN or over internet. The Linux must be listening to the port SSH and should keep firewall open.
sudo apt update sudo apt install openssh-server sudo systemctl status ssh sudo ufw allow ssh
Ubuntu
Change Timezone in Ubuntu 20.04 – Simple method
This method to change timezone works for both Ubuntu 18.04 and Ubuntu 20.04
timedate ctl
Shows the time of server
To change, search for your timezone from the available list and copy the text
timedatectl list-timezones | grep Kolkata
Unlink the present server Timezone
sudo unlink /etc/localtime
Now set the time zone
The syntax for setting the new time zone is as below
sudo ln -s /usr/share/zoneinfo/[zone/timezone] /etc/localtime
For example sudo ln -s /usr/share/zoneinfo/Asia/Kolkata /etc/localtime
Mission successful
Now check date and time using timedatectl
Output for timedatectl list-timezones
Output for the timedatectl list-timezones. All the list in one place.
You would be seeing a very big list and so will be difficult to sort it out and find your timezone out of it. So I have mentioned all timezone lists in this post.
shortcut to find the timezones from the command itself is timedatectl list-timezones | grep Kolkata
| Africa/Abidjan Africa/Accra | |
| Africa/Addis_Ababa | |
| Africa/Algiers | |
| Africa/Asmara | |
| Africa/Bamako | |
| Africa/Bangui | |
| Africa/Banjul | |
| Africa/Bissau | |
| Africa/Blantyre | |
| Africa/Brazzaville | |
| Africa/Bujumbura | |
| Africa/Cairo | |
| Africa/Casablanca | |
| Africa/Ceuta | |
| Africa/Conakry | |
| Africa/Dakar | |
| Africa/Dar_es_Salaam | |
| Africa/Djibouti | |
| Africa/Douala | |
| Africa/El_Aaiun | |
| Africa/Freetown | |
| Africa/Gaborone | |
| Africa/Harare | |
| Africa/Johannesburg | |
| Africa/Juba | |
| Africa/Kampala | |
| Africa/Khartoum | |
| Africa/Kigali | |
| Africa/Kinshasa | |
| Africa/Lagos | |
| Africa/Libreville | |
| Africa/Lome | |
| Africa/Luanda | |
| Africa/Lubumbashi | |
| Africa/Lusaka | |
| Africa/Malabo | |
| Africa/Maputo | |
| Africa/Maseru | |
| Africa/Mbabane | |
| Africa/Mogadishu | |
| Africa/Monrovia | |
| Africa/Nairobi | |
| Africa/Ndjamena | |
| Africa/Niamey | |
| Africa/Nouakchott | |
| Africa/Ouagadougou | |
| Africa/Porto-Novo | |
| Africa/Sao_Tome | |
| Africa/Tripoli | |
| Africa/Tunis | |
| Africa/Windhoek | |
| America/Adak | |
| America/Anchorage | |
| America/Anguilla | |
| America/Antigua | |
| America/Araguaina | |
| America/Argentina/Buenos_Aires | |
| America/Argentina/Catamarca | |
| America/Argentina/Cordoba | |
| America/Argentina/Jujuy | |
| America/Argentina/La_Rioja | |
| America/Argentina/Mendoza | |
| America/Argentina/Rio_Gallegos | |
| America/Argentina/Salta | |
| America/Argentina/San_Juan | |
| America/Argentina/San_Luis | |
| America/Argentina/Tucuman | |
| America/Argentina/Ushuaia | |
| America/Aruba | |
| America/Asuncion | |
| America/Atikokan | |
| America/Bahia | |
| America/Bahia_Banderas | |
| America/Barbados | |
| America/Belem | |
| America/Belize | |
| America/Blanc-Sablon | |
| America/Boa_Vista | |
| America/Bogota | |
| America/Boise | |
| America/Cambridge_Bay | |
| America/Campo_Grande | |
| America/Cancun | |
| America/Caracas | |
| America/Cayenne | |
| America/Cayman | |
| America/Chicago | |
| America/Chihuahua | |
| America/Costa_Rica | |
| America/Creston | |
| America/Cuiaba | |
| America/Curacao | |
| America/Danmarkshavn | |
| America/Dawson | |
| America/Dawson_Creek | |
| America/Denver | |
| America/Detroit | |
| America/Dominica | |
| America/Edmonton | |
| America/Eirunepe | |
| America/El_Salvador | |
| America/Fort_Nelson | |
| America/Fortaleza | |
| America/Glace_Bay | |
| America/Godthab | |
| America/Goose_Bay | |
| America/Grand_Turk | |
| America/Grenada | |
| America/Guadeloupe | |
| America/Guatemala | |
| America/Guayaquil | |
| America/Guyana | |
| America/Halifax | |
| America/Havana | |
| America/Hermosillo | |
| America/Indiana/Indianapolis | |
| America/Indiana/Knox | |
| America/Indiana/Marengo | |
| America/Indiana/Petersburg | |
| America/Indiana/Tell_City | |
| America/Indiana/Vevay | |
| America/Indiana/Vincennes | |
| America/Indiana/Winamac | |
| America/Inuvik | |
| America/Iqaluit | |
| America/Jamaica | |
| America/Juneau | |
| America/Kentucky/Louisville | |
| America/Kentucky/Monticello | |
| America/Kralendijk | |
| America/La_Paz | |
| America/Lima | |
| America/Los_Angeles | |
| America/Lower_Princes | |
| America/Maceio | |
| America/Managua | |
| America/Manaus | |
| America/Marigot | |
| America/Martinique | |
| America/Matamoros | |
| America/Mazatlan | |
| America/Menominee | |
| America/Merida | |
| America/Metlakatla | |
| America/Mexico_City | |
| America/Miquelon | |
| America/Moncton | |
| America/Monterrey | |
| America/Montevideo | |
| America/Montserrat | |
| America/Nassau | |
| America/New_York | |
| America/Nipigon | |
| America/Nome | |
| America/Noronha | |
| America/North_Dakota/Beulah | |
| America/North_Dakota/Center | |
| America/North_Dakota/New_Salem | |
| America/Ojinaga | |
| America/Panama | |
| America/Pangnirtung | |
| America/Paramaribo | |
| America/Phoenix | |
| America/Port-au-Prince | |
| America/Port_of_Spain | |
| America/Porto_Velho | |
| America/Puerto_Rico | |
| America/Rainy_River | |
| America/Rankin_Inlet | |
| America/Recife | |
| America/Regina | |
| America/Resolute | |
| America/Rio_Branco | |
| America/Santarem | |
| America/Santiago | |
| America/Santo_Domingo | |
| America/Sao_Paulo | |
| America/Scoresbysund | |
| America/Sitka | |
| America/St_Barthelemy | |
| America/St_Johns | |
| America/St_Kitts | |
| America/St_Lucia | |
| America/St_Thomas | |
| America/St_Vincent | |
| America/Swift_Current | |
| America/Tegucigalpa | |
| America/Thule | |
| America/Thunder_Bay | |
| America/Tijuana | |
| America/Toronto | |
| America/Tortola | |
| America/Vancouver | |
| America/Whitehorse | |
| America/Winnipeg | |
| America/Yakutat | |
| America/Yellowknife | |
| Antarctica/Casey | |
| Antarctica/Davis | |
| Antarctica/DumontDUrville | |
| Antarctica/Macquarie | |
| Antarctica/Mawson | |
| Antarctica/McMurdo | |
| Antarctica/Palmer | |
| Antarctica/Rothera | |
| Antarctica/Syowa | |
| Antarctica/Troll | |
| Antarctica/Vostok | |
| Arctic/Longyearbyen | |
| Asia/Aden | |
| Asia/Almaty | |
| Asia/Amman | |
| Asia/Anadyr | |
| Asia/Aqtau | |
| Asia/Aqtobe | |
| Asia/Ashgabat | |
| Asia/Atyrau | |
| Asia/Baghdad | |
| Asia/Bahrain | |
| Asia/Baku | |
| Asia/Bangkok | |
| Asia/Barnaul | |
| Asia/Beirut | |
| Asia/Bishkek | |
| Asia/Brunei | |
| Asia/Chita | |
| Asia/Choibalsan | |
| Asia/Colombo | |
| Asia/Damascus | |
| Asia/Dhaka | |
| Asia/Dili | |
| Asia/Dubai | |
| Asia/Dushanbe | |
| Asia/Famagusta | |
| Asia/Gaza | |
| Asia/Hebron | |
| Asia/Ho_Chi_Minh | |
| Asia/Hong_Kong | |
| Asia/Hovd | |
| Asia/Irkutsk | |
| Asia/Jakarta | |
| Asia/Jayapura | |
| Asia/Jerusalem | |
| Asia/Kabul | |
| Asia/Kamchatka | |
| Asia/Karachi | |
| Asia/Kathmandu | |
| Asia/Khandyga | |
| Asia/Kolkata | |
| Asia/Krasnoyarsk | |
| Asia/Kuala_Lumpur | |
| Asia/Kuching | |
| Asia/Kuwait | |
| Asia/Macau | |
| Asia/Magadan | |
| Asia/Makassar | |
| Asia/Manila | |
| Asia/Muscat | |
| Asia/Nicosia | |
| Asia/Novokuznetsk | |
| Asia/Novosibirsk | |
| Asia/Omsk | |
| Asia/Oral | |
| Asia/Phnom_Penh | |
| Asia/Pontianak | |
| Asia/Pyongyang | |
| Asia/Qatar | |
| Asia/Qyzylorda | |
| Asia/Riyadh | |
| Asia/Sakhalin | |
| Asia/Samarkand | |
| Asia/Seoul | |
| Asia/Shanghai | |
| Asia/Singapore | |
| Asia/Srednekolymsk | |
| Asia/Taipei | |
| Asia/Tashkent | |
| Asia/Tbilisi | |
| Asia/Tehran | |
| Asia/Thimphu | |
| Asia/Tokyo | |
| Asia/Tomsk | |
| Asia/Ulaanbaatar | |
| Asia/Urumqi | |
| Asia/Ust-Nera | |
| Asia/Vientiane | |
| Asia/Vladivostok | |
| Asia/Yakutsk | |
| Asia/Yangon | |
| Asia/Yekaterinburg | |
| Asia/Yerevan | |
| Atlantic/Azores | |
| Atlantic/Bermuda | |
| Atlantic/Canary | |
| Atlantic/Cape_Verde | |
| Atlantic/Faroe | |
| Atlantic/Madeira | |
| Atlantic/Reykjavik | |
| Atlantic/South_Georgia | |
| Atlantic/St_Helena | |
| Atlantic/Stanley | |
| Australia/Adelaide | |
| Australia/Brisbane | |
| Australia/Broken_Hill | |
| Australia/Currie | |
| Australia/Darwin | |
| Australia/Eucla | |
| Australia/Hobart | |
| Australia/Lindeman | |
| Australia/Lord_Howe | |
| Australia/Melbourne | |
| Australia/Perth | |
| Australia/Sydney | |
| Europe/Amsterdam | |
| Europe/Andorra | |
| Europe/Astrakhan | |
| Europe/Athens | |
| Europe/Belgrade | |
| Europe/Berlin | |
| Europe/Bratislava | |
| Europe/Brussels | |
| Europe/Bucharest | |
| Europe/Budapest | |
| Europe/Busingen | |
| Europe/Chisinau | |
| Europe/Copenhagen | |
| Europe/Dublin | |
| Europe/Gibraltar | |
| Europe/Guernsey | |
| Europe/Helsinki | |
| Europe/Isle_of_Man | |
| Europe/Istanbul | |
| Europe/Jersey | |
| Europe/Kaliningrad | |
| Europe/Kiev | |
| Europe/Kirov | |
| Europe/Lisbon | |
| Europe/Ljubljana | |
| Europe/London | |
| Europe/Luxembourg | |
| Europe/Madrid | |
| Europe/Malta | |
| Europe/Mariehamn | |
| Europe/Minsk | |
| Europe/Monaco | |
| Europe/Moscow | |
| Europe/Oslo | |
| Europe/Paris | |
| Europe/Podgorica | |
| Europe/Prague | |
| Europe/Riga | |
| Europe/Rome | |
| Europe/Samara | |
| Europe/San_Marino | |
| Europe/Sarajevo | |
| Europe/Saratov | |
| Europe/Simferopol | |
| Europe/Skopje | |
| Europe/Sofia | |
| Europe/Stockholm | |
| Europe/Tallinn | |
| Europe/Tirane | |
| Europe/Ulyanovsk | |
| Europe/Uzhgorod | |
| Europe/Vaduz | |
| Europe/Vatican | |
| Europe/Vienna | |
| Europe/Vilnius | |
| Europe/Volgograd | |
| Europe/Warsaw | |
| Europe/Zagreb | |
| Europe/Zaporozhye | |
| Europe/Zurich | |
| Indian/Antananarivo | |
| Indian/Chagos | |
| Indian/Christmas | |
| Indian/Cocos | |
| Indian/Comoro | |
| Indian/Kerguelen | |
| Indian/Mahe | |
| Indian/Maldives | |
| Indian/Mauritius | |
| Indian/Mayotte | |
| Indian/Reunion | |
| Pacific/Apia | |
| Pacific/Auckland | |
| Pacific/Bougainville | |
| Pacific/Chatham | |
| Pacific/Chuuk | |
| Pacific/Easter | |
| Pacific/Efate | |
| Pacific/Enderbury | |
| Pacific/Fakaofo | |
| Pacific/Fiji | |
| Pacific/Funafuti | |
| Pacific/Galapagos | |
| Pacific/Gambier | |
| Pacific/Guadalcanal | |
| Pacific/Guam | |
| Pacific/Honolulu | |
| Pacific/Johnston | |
| Pacific/Kiritimati | |
| Pacific/Kosrae | |
| Pacific/Kwajalein | |
| Pacific/Majuro | |
| Pacific/Marquesas | |
| Pacific/Midway | |
| Pacific/Nauru | |
| Pacific/Niue | |
| Pacific/Norfolk | |
| Pacific/Noumea | |
| Pacific/Pago_Pago | |
| Pacific/Palau | |
| Pacific/Pitcairn | |
| Pacific/Pohnpei | |
| Pacific/Port_Moresby | |
| Pacific/Rarotonga | |
| Pacific/Saipan | |
| Pacific/Tahiti | |
| Pacific/Tarawa | |
| Pacific/Tongatapu | |
| Pacific/Wake | |
| Pacific/Wallis | |
| UTC |