有问题 - 无法更新 Ubuntu。通过软件更新程序，我收到“检查您的互联网连接”消息。通过终端：
sudo apt-get update
Hit:1 http://lv.archive.ubuntu.com/ubuntu jammy InRelease
Get:2 http://repo.steampowered.com/steam stable InRelease [2 861 B]
Get:3 http://lv.archive.ubuntu.com/ubuntu jammy-updates InRelease [119 kB]
Err:2 http://repo.steampowered.com/steam stable InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F24AEA9FB05498B7
Get:4 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]
Get:5 http://lv.archive.ubuntu.com/ubuntu jammy-backports InRelease [107 kB]
Get:6 http://lv.archive.ubuntu.com/ubuntu jammy-updates/main amd64 DEP-11 Metadata [102 kB]
Get:7 http://lv.archive.ubuntu.com/ubuntu jammy-updates/universe amd64 DEP-11 Metadata [269 kB]
Get:8 http://lv.archive.ubuntu.com/ubuntu jammy-updates/multiverse amd64 DEP-11 Metadata [940 B]
Get:9 http://lv.archive.ubuntu.com/ubuntu jammy-backports/main amd64 DEP-11 Metadata [8 016 B]
Get:10 http://lv.archive.ubuntu.com/ubuntu jammy-backports/universe amd64 DEP-11 Metadata [12,5 kB]
Get:11 http://security.ubuntu.com/ubuntu jammy-security/main amd64 DEP-11 Metadata [41,6 kB]
Get:12 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 DEP-11 Metadata [17,1 kB]
Reading package lists... Done
W: GPG error: http://repo.steampowered.com/steam stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F24AEA9FB05498B7
E: The repository 'http://repo.steampowered.com/steam stable InRelease' is not signed.
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.
我尝试过一个解决方案，即：
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys F24AEA9FB05498B7
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
Executing: /tmp/apt-key-gpghome.k7KsmtABvG/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys F24AEA9FB05498B7
gpg: key F24AEA9FB05498B7: "Valve Corporation <[email protected]>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
这毫无作用。请帮忙！我没主意了！谷歌也是！