解決卸載失敗問題 “device is busy”
umount: /dev/sda1: device is busy
$ fuser -vm /dev/sda1
/dev/sda1 6015c 6132
亦使用命令「ps auxw | grep PID」獲知個別程式的詳細資訊：
$ ps auxw | grep 6132
johndoe 6132 0.4 3.0 220017 57104 ? S+ 18:27 0:00 rhythmbo
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使用 netselect-apt 選擇最佳鏡像站台加入 sources.list
# ls sources.list
ls: sources.list: File or directory not found
# netselect-apt stable
(...)
# ls -l sources.list
sources.list
直接用這個也可以
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# Debian packages for stable
deb http://debian.cs.nctu.edu.tw/debian/ stable main contrib
# Uncomment the deb-src line if you want 'apt-get source'
# to work with most packages.
deb http://debian.cs.nctu.edu.tw/debian/ bullseye main contrib non-free
# Security updates for stable
#deb http://security.debian.org/ stable/updates main contrib
deb http://deb.debian.org/debian bullseye main contrib non-free
#deb-src http://deb.debian.org/debian bullseye main contrib non-free
deb http://deb.debian.org/debian bullseye-updates main contrib non-free
#deb-src http://deb.debian.org/debian bullseye-updates main contrib non-free
deb http://deb.debian.org/debian bullseye-backports main contrib non-free
#deb-src http://deb.debian.org/debian bullseye-backports main contrib non-free
deb http://security.debian.org/ bullseye-security main contrib non-free
#deb-src http://security.debian.org/ bullseye-security main contrib non-free
