存储库似乎丢失了。有人知道如何修复吗？
$ sudo apt-get update
...
Do you want to continue? [Y/n] y
Err:1 http://fr.archive.ubuntu.com/ubuntu zesty/universe amd64 libsdl2-2.0-0 amd64 2.0.5+dfsg1-2ubuntu3
404 Not Found
Err:2 http://fr.archive.ubuntu.com/ubuntu zesty/universe amd64
libavdevice57 amd64 7:3.2.4-1build2
404 Not Found
Err:3 http://fr.archive.ubuntu.com/ubuntu zesty/multiverse amd64
libfdk-aac1 amd64 0.1.4-2
404 Not Found
E: Failed to fetch
http://fr.archive.ubuntu.com/ubuntu/pool/universe/
libs/libsdl2/libsdl2-2.0-0_2.0.5+dfsg1-2ubuntu3_amd64.deb
404 Not Found
E: Failed to fetch
http://fr.archive.ubuntu.com/ubuntu/pool/universe
/f/ffmpeg/libavdevice57_3.2.4-1build2_amd64.deb
404 Not Found
E: Failed to fetch http://fr.archive.ubuntu.com/ubuntu/pool/multiverse/f/fdk-aac/libfdk-aac1_0.1.4-2_amd64.deb 404 Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with
--fix-missing?