The method driver /usr/lib/apt/methods/https could not be found.

apt-get ??https

正在使用Raspberry Pi照著網站安裝RPi-Monitor後要更新apt套件來源時，卻發生下面問題：

root@raspberrypi apt-get update
E: The method driver /usr/lib/apt/methods/https could not be found.

查結果主要原因是我在加上RPi-Monitor的Source list中加入來源有https開頭的網址：

root@raspberrypi /etc/apt/sources.list.d # cat /etc/apt/sources.list.d/rpimonitor.list
# RPi-Monitor official repository
deb https://github.com XavierBerger/RPi-Monitor-deb/raw/master/repo/
root@raspberrypi /etc/apt/sources.list.d #

但預設未安裝apt-transport-https套件造成無法支援含有https的來源，此時必需要先將https開頭的來源位址改成http或是先暫時移除來源：

rm /etc/apt/sources.list.d/rpimonitor.list

讓apt-get update能順利更新列表，更新列表後再進行安裝apt-transport-https：

root@raspberrypi /etc/apt/sources.list.d # apt-get install apt-transport-https
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  apt-transport-https
0 upgraded, 1 newly installed, 0 to remove and 142 not upgraded.
Need to get 109 kB of archives.
After this operation, 166 kB of additional disk space will be used.
Get:1 http://archive.raspbian.org/raspbian/ wheezy/main apt-transport-https armhf 0.9.7.9+rpi1+deb7u7 [109 kB]
Fetched 109 kB in 2s (54.0 kB/s)
Selecting previously unselected package apt-transport-https.
(Reading database ... 71792 files and directories currently installed.)
Unpacking apt-transport-https (from .../apt-transport-https_0.9.7.9+rpi1+deb7u7_armhf.deb) ...
Setting up apt-transport-https (0.9.7.9+rpi1+deb7u7) ...
root@raspberrypi /etc/apt/sources.list.d #

此時你的apt-get就能支援https功能。