运行sudo apt-get install python之后输入y然后报错，404 not found。
Do you want to continue? [Y/n] y
Ign:1 http://us-east1.gce.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libpython2.7-minimal amd64 2.7.1
7-1~18.04ubuntu1.2
Ign:2 http://us-east1.gce.archive.ubuntu.com/ubuntu bionic-updates/main amd64 python2.7-minimal amd64 2.7.17-1
~18.04ubuntu1.2
Ign:3 http://us-east1.gce.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libpython2.7-stdlib amd64 2.7.17
-1~18.04ubuntu1.2
Err:1 http://security.ubuntu.com/ubuntu bionic-updates/main amd64 libpython2.7-minimal amd64 2.7.17-1~18.04ubu
ntu1.2
404 Not Found [IP: 35.196.129.83 80]
Ign:4 http://us-east1.gce.archive.ubuntu.com/ubuntu bionic-updates/main amd64 python2.7 amd64 2.7.17-1~18.04ub
untu1.2
Err:2 http://security.ubuntu.com/ubuntu bionic-updates/main amd64 python2.7-minimal amd64 2.7.17-1~18.04ubuntu
1.2
404 Not Found [IP: 35.196.129.83 80]
Err:3 http://security.ubuntu.com/ubuntu bionic-updates/main amd64 libpython2.7-stdlib amd64 2.7.17-1~18.04ubun
tu1.2
404 Not Found [IP: 35.196.129.83 80]
Err:4 http://security.ubuntu.com/ubuntu bionic-updates/main amd64 python2.7 amd64 2.7.17-1~18.04ubuntu1.2
404 Not Found [IP: 35.196.129.83 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/python2.7/libpython2.7-minimal_2.7.17-1~18.04
ubuntu1.2_amd64.deb 404 Not Found [IP: 35.196.129.83 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/python2.7/python2.7-minimal_2.7.17-1~18.04ubu
ntu1.2_amd64.deb 404 Not Found [IP: 35.196.129.83 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/python2.7/libpython2.7-stdlib_2.7.17-1~18.04u
buntu1.2_amd64.deb 404 Not Found [IP: 35.196.129.83 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/python2.7/python2.7_2.7.17-1~18.04ubuntu1.2_a
md64.deb 404 Not Found [IP: 35.196.129.83 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?