Ubuntu 16.10 apt-get update failed

because the mysql installation using apt-get install cannot find package, it is apt-get update according to the search solution. But almost all the methods were tried and failed. I don"t know how they installed it successfully. Error message: 

Reading package lists... Done
W: The repository "https://mirrors.tuna.tsinghua.edu.cn/ubuntu yakkety Release" does not have a Release file.
N: Data from such a repository can"t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository "https://mirrors.tuna.tsinghua.edu.cn/ubuntu yakkety-updates Release" does not have a Release file.
N: Data from such a repository can"t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository "https://mirrors.tuna.tsinghua.edu.cn/ubuntu yakkety-backports Release" does not have a Release file.
N: Data from such a repository can"t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository "https://mirrors.tuna.tsinghua.edu.cn/ubuntu yakkety-security Release" does not have a Release file.
N: Data from such a repository can"t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/yakkety/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/yakkety-updates/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/yakkety-backports/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/yakkety-security/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Apt-get ubuntu
Mar.26,2022

you need to understand the Ubuntu development cycle. The version you are using is no longer maintained and the software repository has been officially removed.

https://wiki.ubuntu.com/Releases

you should use the previous LTS version (16.04) or the next LTS version (18.04)

if there is really a reason to use the EOL version, there is a temporary solution to deal with it, that is, to use ubuntu's EOL Release repository:

https://help.ubuntu.com/commu.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b37697-2c09b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b37697-2c09b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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