others-how to solve the apt-get update error on ubuntu system?
1. Purpose
In this post, I will show you how to solve apt-get update error on ubuntu system.
Sometimes, when you want to update software on ubuntu system:
(base) root@myubuntu:/opt/temp# apt-get update
Ign:1 https://mirrors.tuna.tsinghua.edu.cn jammy InRelease
Ign:2 https://mirrors.tuna.tsinghua.edu.cn jammy-updates InRelease
Ign:3 https://mirrors.tuna.tsinghua.edu.cn jammy-backports InRelease
Ign:4 https://mirrors.tuna.tsinghua.edu.cn jammy-security InRelease
Err:5 https://mirrors.tuna.tsinghua.edu.cn jammy Release
404 Not Found [IP: 101.6.15.130 443]
Err:6 https://mirrors.tuna.tsinghua.edu.cn jammy-updates Release
404 Not Found [IP: 101.6.15.130 443]
Err:7 https://mirrors.tuna.tsinghua.edu.cn jammy-backports Release
404 Not Found [IP: 101.6.15.130 443]
Err:8 https://mirrors.tuna.tsinghua.edu.cn jammy-security Release
404 Not Found [IP: 101.6.15.130 443]
Reading package lists... Done
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn jammy Release' no longer has 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 'https://mirrors.tuna.tsinghua.edu.cn jammy-updates Release' no longer has 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 'https://mirrors.tuna.tsinghua.edu.cn jammy-backports Release' no longer has 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 'https://mirrors.tuna.tsinghua.edu.cn jammy-security Release' no longer has 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.
(base) root@myubuntu:/opt/temp#
2. Solution
Change /etc/apt/sources.list，set as follows：
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
rerun apt update，if still error like following：
(base) root@myubuntu:/etc/apt# apt update
Get:2 http://mirrors.aliyun.com/ubuntu bionic InRelease [242 kB]
Err:2 http://mirrors.aliyun.com/ubuntu bionic InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
Get:3 http://mirrors.aliyun.com/ubuntu bionic-security InRelease [88.7 kB]
Get:4 http://mirrors.aliyun.com/ubuntu bionic-updates InRelease [88.7 kB]
Err:3 http://mirrors.aliyun.com/ubuntu bionic-security InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
Get:5 http://mirrors.aliyun.com/ubuntu bionic-proposed InRelease [242 kB]
Err:4 http://mirrors.aliyun.com/ubuntu bionic-updates InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
Err:5 http://mirrors.aliyun.com/ubuntu bionic-proposed InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
Get:6 http://mirrors.aliyun.com/ubuntu bionic-backports InRelease [83.3 kB]
Err:6 http://mirrors.aliyun.com/ubuntu bionic-backports InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
Get:1 https://apt.llvm.org/trusty llvm-toolchain-trusty InRelease [4,235 B]
Err:1 https://apt.llvm.org/trusty llvm-toolchain-trusty InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 15CF4D18AF4F7421
Reading package lists... Done
W: GPG error: http://mirrors.aliyun.com/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
E: The repository 'http://mirrors.aliyun.com/ubuntu bionic 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.
W: GPG error: http://mirrors.aliyun.com/ubuntu bionic-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
E: The repository 'http://mirrors.aliyun.com/ubuntu bionic-security 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.
W: GPG error: http://mirrors.aliyun.com/ubuntu bionic-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
E: The repository 'http://mirrors.aliyun.com/ubuntu bionic-updates 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.
W: GPG error: http://mirrors.aliyun.com/ubuntu bionic-proposed InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
E: The repository 'http://mirrors.aliyun.com/ubuntu bionic-proposed 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.
W: GPG error: http://mirrors.aliyun.com/ubuntu bionic-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32
E: The repository 'http://mirrors.aliyun.com/ubuntu bionic-backports 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.
W: GPG error: https://apt.llvm.org/trusty llvm-toolchain-trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 15CF4D18AF4F7421
E: The repository 'http://apt.llvm.org/trusty llvm-toolchain-trusty 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.
(base) root@myubuntu:/etc/apt#
The solution: Note that the last parameter below is the PUBKEY content reported in the above error.
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32
Then it works!
3. Summary
In this post, I demonstrated how to solve the apt update error on ubuntu system. That’s it, thanks for your reading.