【Ubuntu】sudoコマンドのインストール方法（使えない場合）

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sudo apt update

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bash: sudo: command not found

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su - root

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whoami

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root

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apt update

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apt list sudo

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Listing... Done
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sudo/noble 1.9.15p5-3ubuntu5 amd64

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apt install sudo -y

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Reading package lists... Done
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Building dependency tree... Done
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Reading state information... Done
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The following NEW packages will be installed:
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  sudo
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0 upgraded, 1 newly installed, 0 to remove and 19 not upgraded.
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Need to get 948 kB of archives.
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After this operation, 3547 kB of additional disk space will be used.
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Get:1 http://archive.ubuntu.com/ubuntu noble/main amd64 sudo amd64 1.9.15p5-3ubuntu5 [948 kB]
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Fetched 948 kB in 6s (164 kB/s)
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debconf: delaying package configuration, since apt-utils is not installed
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Selecting previously unselected package sudo.
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(Reading database ... 50796 files and directories currently installed.)
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Preparing to unpack .../sudo_1.9.15p5-3ubuntu5_amd64.deb ...
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Unpacking sudo (1.9.15p5-3ubuntu5) ...
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Setting up sudo (1.9.15p5-3ubuntu5) ...
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Processing triggers for libc-bin (2.39-0ubuntu8.2) ...

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apt list sudo

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Listing... Done
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sudo/noble,now 1.9.15p5-3ubuntu5 amd64 [installed]

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exit

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whoami

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sudo apt update

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$ sudo apt update
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Hit:1 http://security.ubuntu.com/ubuntu noble-security InRelease
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Hit:2 http://archive.ubuntu.com/ubuntu noble InRelease
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Hit:3 http://archive.ubuntu.com/ubuntu noble-updates InRelease
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Hit:4 http://archive.ubuntu.com/ubuntu noble-backports InRelease
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Reading package lists... Done
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Building dependency tree... Done
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Reading state information... Done
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19 packages can be upgraded. Run 'apt list --upgradable' to see them.