ubuntu預設使用的國外的源，在更新的時候會很慢，可以使用國內的阿里的源,那效率和速度,你知道的~
1.先備份檔案
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2.清空
sudo > /etc/apt/sources.list
3.寫入
sudo vim /etc/apt/sources.list
deb trusty main restricted universe multiverse
deb trusty-security main restricted universe multiverse
deb trusty-updates main restricted universe multiverse
deb trusty-proposed main restricted universe multiverse
deb trusty-backports main restricted universe multiverse
deb-src trusty main restricted universe multiverse
deb-src trusty-security main restricted universe multiverse
deb-src trusty-updates main restricted universe multiverse
deb-src trusty-proposed main restricted universe multiverse
deb-src trusty-backports main restricted universe multiverse
sudo apt-get update&&sudo apt-get upgrade&&sudo apt-get install -f
更新ing ...
get:62 trusty-backports/universe i386 packages [43.2 kb]
get:63 trusty-backports/universe amd64 packages [43.1 kb]
get:64 trusty-backports/universe translation-en [36.8 kb]
get:65 trusty-backports/multiverse amd64 packages [1,567 b]
get:66 trusty-backports/multiverse i386 packages [1,551 b]
get:67 trusty-backports/multiverse translation-en [1,215 b]
get:68 trusty/restricted sources [5,433 b]
get:69 trusty/universe sources [6,399 kb]
get:70 trusty/multiverse sources [174 kb]
get:71 trusty/main sources [1,064 kb]
get:72 trusty/main amd64 packages [1,350 kb]
get:73 trusty/main i386 packages [1,348 kb]
get:74 trusty/restricted amd64 packages [13.0 kb]
get:75 trusty/restricted i386 packages [13.4 kb]
get:76 trusty/universe amd64 packages [5,859 kb]
get:77 trusty/universe i386 packages [5,866 kb]
get:78 trusty/multiverse i386 packages [134 kb]
get:79 trusty/multiverse amd64 packages [132 kb]
fetched 30.3 mb in 34s (896 kb/s)
reading package lists... done
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