W:GPG error: http://packages.ros.org lucid InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5523BAEEB01FA116, W:Failed to fetch http://mirrors.skyshe.cn/ubuntu/dists/t ... 4/Packages Hash Sum mismatch
, W:Failed to fetch http://mirrors.skyshe.cn/ubuntu/dists/t ... 4/Packages Hash Sum mismatch
, W:Failed to fetch http://mirrors.skyshe.cn/ubuntu/dists/t ... 4/Packages Hash Sum mismatch
, W:Failed to fetch http://mirrors.skyshe.cn/ubuntu/dists/t ... 6/Packages Hash Sum mismatch
, W:Failed to fetch http://archive.canonical.com/ubuntu/dis ... 4/Packages Hash Sum mismatch
, W:Failed to fetch http://mirrors.skyshe.cn/ubuntu/dists/t ... 4/Packages Hash Sum mismatch
, W:Failed to fetch http://mirrors.skyshe.cn/ubuntu/dists/t ... 4/Packages Hash Sum mismatch
, W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/t ... ce/Sources Hash Sum mismatch
, W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/t ... 4/Packages Hash Sum mismatch
, W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/t ... 6/Packages Hash Sum mismatch
, W:Failed to fetch http://mirrors.skyshe.cn/ubuntu/dists/t ... 4/Packages Hash Sum mismatch
, E:Some index files failed to download. They have been ignored, or old ones used instead.

把下面指令 複製 貼進終端機 執行
1. sudo cat /etc/apt/sources.list
2. sudo ls -Al /etc/apt/sources.list.d
把結果全部直接 選取/複製/貼上來