我無法在 cloud9 上為我的 BeagleBone apt-get 安裝任何軟體包，因為E: Package 'mongodb' has no installation candidate.由於同樣的錯誤，我無法讓任何軟體包正常工作。我已經更新、升級、重新啟動，但沒有任何效果。
有關我的 BBG 的更多資訊：
debian@beaglebone:/var/lib/cloud9$ uname -a
Linux beaglebone 4.9.82-ti-r102 #1 SMP PREEMPT Thu Feb 22 01:16:12 UTC 2018 armv7l GNU/Linux
debian@beaglebone:/var/lib/cloud9$ cat /etc/*-release
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
另外，這是我的sources.list 檔案：
GNU nano 2.7.4 File: /etc/apt/sources.list
deb http://deb.debian.org/debian stretch main contrib non-free
#deb-src http://deb.debian.org/debian stretch main contrib non-free
deb http://deb.debian.org/debian stretch-updates main contrib non-free
#deb-src http://deb.debian.org/debian stretch-updates main contrib non-free
deb http://deb.debian.org/debian-security stretch/updates main contrib non-free
#deb-src http://deb.debian.org/debian-security stretch/updates main contrib non-free
#deb http://deb.debian.org/debian stretch-backports main contrib non-free
##deb-src http://deb.debian.org/debian stretch-backports main contrib non-free
#Kernel source (repos.rcn-ee.com) : https://github.com/RobertCNelson/linux-stable-rcn-ee
#
#git clone https://github.com/RobertCNelson/linux-stable-rcn-ee
#cd ./linux-stable-rcn-ee
#git checkout `uname -r` -b tmp
#
deb [arch=armhf] http://repos.rcn-ee.com/debian/ stretch main
#deb-src [arch=armhf] http://repos.rcn-ee.com/debian/ stretch main
deb http://debian.mirror.ac.za/debian stretch main
#deb-src http://debian.mirror.ac.za/debian stretch main
答案1
armhf您的 BeagleBone 使用的架構不支援 MongoDB ；看#836435了解詳情。因此，它在 Debian 9 及更高版本的 Debian 儲存庫中不再可用。