我执行了命令：
$ sudo apt-get install ssh-import-id
输出是（因为评论中的人要求完全提供它）：
$ sudo apt-get install ssh-import-id
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
gdbserver gstreamer1.0-gtk3 libabw-0.1-1 libatkmm-1.6-1v5 libbabeltrace1 libc6-dbg libcairomm-1.0-1v5 libcdr-0.1-1
libcolamd2 libdw1 libe-book-0.1-1 libepubgen-0.1-1 libetonyek-0.1-1 libfreehand-0.1-1 libglibmm-2.4-1v5 libgtkmm-2.4-1v5
libilmbase12 libmspub-0.1-1 libmwaw-0.3-3 libnuma1 libodfgen-0.1-1 libopenexr22 libpangomm-1.4-1v5 libsuitesparseconfig5
libvisio-0.1-1 libwpd-0.10-10 libwpg-0.3-3 libwps-0.4-4 libxss1 libxvmc1 lp-solve vim-common x11-apps x11-session-utils
xbitmaps xinit xserver-xorg-video-amdgpu-hwe-18.04 xserver-xorg-video-ati-hwe-18.04 xserver-xorg-video-fbdev-hwe-18.04
xserver-xorg-video-intel-hwe-18.04 xserver-xorg-video-nouveau-hwe-18.04 xserver-xorg-video-qxl-hwe-18.04
xserver-xorg-video-radeon-hwe-18.04 xserver-xorg-video-vesa-hwe-18.04 xxd
Use …