[Linux]OSインストール後の初期設定

$ sudo apt update -y
$ sudo apt upgrade -y
$ sudo apt autoremove -y
$ reboot

$ tzselect
Please identify a location so that time zone rules can be set correctly.
Please select a continent, ocean, "coord", or "TZ".
 1) Africa
 2) Americas
 3) Antarctica
 4) Asia
 5) Atlantic Ocean
 6) Australia
 7) Europe
 8) Indian Ocean
 9) Pacific Ocean
10) coord - I want to use geographical coordinates.
11) TZ - I want to specify the timezone using the Posix TZ format.
#? 4
Please select a country whose clocks agree with yours.
 1) Afghanistan             29) Kyrgyzstan
 2) Antarctica             30) Laos
 3) Armenia             31) Lebanon
 4) Azerbaijan             32) Macau
 5) Bahrain             33) Malaysia
 6) Bangladesh             34) Mongolia
 7) Bhutan             35) Myanmar (Burma)
 8) Brunei             36) Nepal
 9) Cambodia             37) Oman
10) China             38) Pakistan
11) Christmas Island         39) Palestine
12) Cocos (Keeling) Islands  40) Philippines
13) Cyprus             41) Qatar
14) East Timor             42) R?union
15) French S. Terr.         43) Russia
16) Georgia             44) Saudi Arabia
17) Hong Kong             45) Seychelles
18) India             46) Singapore
19) Indonesia             47) Sri Lanka
20) Iran             48) Syria
21) Iraq             49) Taiwan
22) Israel             50) Tajikistan
23) Japan             51) Thailand
24) Jordan             52) Turkmenistan
25) Kazakhstan             53) United Arab Emirates
26) Korea (North)         54) Uzbekistan
27) Korea (South)         55) Vietnam
28) Kuwait             56) Yemen
#? 23

The following information has been given:

    Japan

Therefore TZ='Asia/Tokyo' will be used.
Selected time is now:    Fri Jun 28 10:24:46 JST 2024.
Universal Time is now:    Fri Jun 28 01:24:46 UTC 2024.
Is the above information OK?
1) Yes
2) No
#? 1

You can make this change permanent for yourself by appending the line
    TZ='Asia/Tokyo'; export TZ
to the file '.profile' in your home directory; then log out and log in again.

Here is that TZ value again, this time on standard output so that you
can use the /usr/bin/tzselect command in shell scripts:
Asia/Tokyo

$ sudo localectl set-keymap jp
$ sudo localectl set-x11-keymap jp

$ sudo dpkg-reconfigure locales

$ sudo apt install ibus-mozc

$ sudo im-config

$ ibus-setup

$ reboot

$ sudo adduser hogehoge
[sudo] password for user:
Adding user `hogehoge' ...
Adding new group `hogehoge' (1006) ...
Adding new user `hogehoge' (1002) with group `hogehoge' ...
Creating home directory `/home/hogehoge' ...
Copying files from `/etc/skel' ...
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
Changing the user information for hogehoge
Enter the new value, or press ENTER for the default
        Full Name []:
        Room Number []:
        Work Phone []:
        Home Phone []:
        Other []:
Is the information correct? [Y/n] Y

$ sudo passwd hogehoge
[sudo] password for user: 
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully

$ groups hogehoge
hogehoge : hogehoge
$ sudo gpasswd -a hogehoge sudo
[sudo] password for user:
Adding user hogehoge to group sudo
$ groups hogehoge
hogehoge : hogehoge sudo

$ reboot
$ sudo deluser --remove-home root

$ ssh-keygen -t rsa -b 4096
Generating public/private rsa key pair.
Enter file in which to save the key (/home/user/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/user/.ssh/id_rsa
Your public key has been saved in /home/user/.ssh/id_rsa.pub
The key fingerprint is:
SHA256:f5hc+awy3LfQ0Nm9om5r2OUR5r6Il9qw2mSkp4A6QP0 user@machine000
The key's randomart image is:
+---[RSA 4096]----+
|                 |
|                 |
|  .              |
| . .         = o.|
|.   .   S.  * + o|
|.   .E  oo + O  .|
|.  . . . *B.B.=. |
| ..   . *.OB+=o  |
| ..    o.=*Oooo. |
+----[SHA256]-----+

$ vi ~/.ssh/authorized_keys

ssh-rsa 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 user@machine000

$ sudo vi /etc/ssh/sshd_config

Port 65535
PermitRootLogin no
PasswordAuthentication no

$ sudo ufw enable
$ sudo ufw default deny
$ sudo ufw allow 80/tcp
$ sudo ufw allow 443/tcp
$ sudo ufw allow 22/tcp

$ LANG=C xdg-user-dirs-gtk-update