输入：
sudo apt-get update
输出：
Hit:1 http://ubuntu.grn.cat/ubuntu noble InRelease
Hit:2 http://security.ubuntu.com/ubuntu noble-security InRelease
Hit:3 https://dl.google.com/linux/chrome/deb stable InRelease
Hit:4 https://dl.winehq.org/wine-builds/ubuntu jammy InRelease
Hit:5 http://ubuntu.grn.cat/ubuntu noble-updates InRelease
Hit:6 http://ubuntu.grn.cat/ubuntu noble-backports InRelease
Ign:7 https://ppa.launchpadcontent.net/obsproject/obs-studio/ubuntu noble InRelease
Hit:8 https://ppa.launchpadcontent.net/pj-assis/ppa/ubuntu noble InRelease
Err:9 https://ppa.launchpadcontent.net/obsproject/obs-studio/ubuntu noble Release
404 Not Found [IP: 185.125.190.80 443]
Reading package lists... Done
W: https://ppa.launchpadcontent.net/pj-assis/ppa/ubuntu/dists/noble/InRelease: Signature by key C657194970C15EFCF804A7969750A93F69FAF7DA uses weak algorithm (rsa1024)
E: The repository 'https://ppa.launchpadcontent.net/obsproject/obs-studio/ubuntu noble 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.