I am unable to update. Please assist. Someone may be illegally hacking into my computer or changed the coding. If someone can verify/assist, or if this is a common error.
$ sudo apt update && sudo apt upgrade -y
Hit:1 http://archive.canonical.c--/ubuntu focal InRelease
Hit:2 https://brave-browser-apt-release.s3.brave.c-- stable InRelease
Hit:3 https://archive.ubuntu.c--/ubuntu focal InRelease
Ign:4 http://ppa.launchpad.n--/audacity-team/daily/ubuntu focal InRelease
Get:5 http://archive.ubuntu.c--/ubuntu focal-updates InRelease [107 kB]
Ign:6 http://ppa.launchpad.n--/oguzhaninan/stacer/ubuntu focal InRelease
Err:7 http://ppa.launchpad.n--/audacity-team/daily/ubuntu focal Release
404 Not Found [IP: 91.189.95.83 80]
Get:8 http://archive.ubuntu.c--/ubuntu focal-backports InRelease [98.3 kB]
Err:9 http://ppa.launchpad.n--/oguzhaninan/stacer/ubuntu focal Release
404 Not Found [IP: 91.189.95.83 80]
Get:10 http://archive.ubuntu.c--/ubuntu focal-security InRelease [107 kB]
Get:11 http://archive.ubuntu.c--/ubuntu focal-updates/main amd64 Packages [200 kB]
Get:12 http://archive.ubuntu.c--/ubuntu focal-updates/main Translation-en [80.1 kB]
Get:13 http://archive.ubuntu.c--/ubuntu focal-updates/main amd64 DEP-11 Metadata [105 kB]
Get:14 http://archive.ubuntu.c--/ubuntu focal-updates/main amd64 c-n-f Metadata [5,884 B]
Get:15 http://archive.ubuntu.c--/ubuntu focal-updates/universe amd64 DEP-11 Metadata [152 kB]
Get:16 http://archive.ubuntu.c--/ubuntu focal-backports/universe amd64 DEP-11 Metadata [532 B]
Get:17 http://archive.ubuntu.c--/ubuntu focal-security/main amd64 Packages [107 kB]
Get:18 http://archive.ubuntu.c--/ubuntu focal-security/main Translation-en [40.9 kB]
Get:19 http://archive.ubuntu.c--/ubuntu focal-security/main amd64 DEP-11 Metadata [21.2 kB]
Get:20 http://archive.ubuntu.c--/ubuntu focal-security/main amd64 c-n-f Metadata [2,908 B]
Get:21 http://archive.ubuntu.c--/ubuntu focal-security/universe amd64 DEP-11 Metadata [31.5 kB]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.n--/audacity-team/daily/ubuntu focal 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.
E: The repository 'http://ppa.launchpad.n--/oguzhaninan/stacer/ubuntu focal 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.