I executed the command:
$ sudo apt-get install ssh-import-id
The output was (as people in the comments asked providing it comletely):
$ 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 'sudo apt autoremove' to remove them. Recommended packages: openssh-server The following packages will be REMOVED: brltty firefox gdb google-chrome-stable gparted irqbalance libcc1-0 libglu1-mesa libllvm6.0 libmagickcore-6.q16-3-extra libpagemaker-0.0-0 libproxy1-plugin-gsettings libreoffice-avmedia-backend-gstreamer libreoffice-base-core libreoffice-calc libreoffice-draw libreoffice-gnome libreoffice-gtk3 libreoffice-help-en-us libreoffice-impress libreoffice-math libreoffice-ogltrans libreoffice-writer libxatracker2 lshw printer-driver-brlaser printer-driver-splix thermald ubuntu-desktop ubuntu-minimal ubuntu-standard vim-tiny xorg xserver-xorg-video-all-hwe-18.04 xserver-xorg-video-vmware-hwe-18.04 zeitgeist-core The following NEW packages will be installed: ssh-import-id 0 upgraded, 1 newly installed, 36 to remove and 0 not upgraded. Need to get 10,4 kB of archives. After this operation, 595 MB disk space will be freed. Do you want to continue? [Y/n] Y Get:1 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 ssh-import-id all 5.7-0ubuntu1 [10,4 kB] Fetched 10,4 kB in 1s (14,5 kB/s) (Reading database ... 127288 files and directories currently installed.) Removing brltty (5.5-4ubuntu2.0.1) ... Removing firefox (68.0.1+build1-0ubuntu0.18.04.1) ... Removing gdb (8.1-0ubuntu3) ... Removing google-chrome-stable (76.0.3809.100-1) ... Removing gparted (0.30.0-3ubuntu1) ... Removing irqbalance (1.3.0-0.1ubuntu0.18.04.1) ... Removing libcc1-0:amd64 (8.3.0-6ubuntu1~18.04.1) ... Removing ubuntu-desktop (1.417.3) ... Removing xorg (1:7.7+19ubuntu7.1) ... Removing libglu1-mesa:amd64 (9.0.0-2.1build1) ... Removing xserver-xorg-video-all-hwe-18.04 (1:7.7+19ubuntu8~18.04.2) ... Removing xserver-xorg-video-vmware-hwe-18.04 (1:13.3.0-2build1~18.04.1) ... Removing libxatracker2:amd64 (19.0.2-1ubuntu1.1~18.04.2) ... Removing libllvm6.0:amd64 (1:6.0-1ubuntu2) ... Removing libmagickcore-6.q16-3-extra:amd64 (8:126.96.36.199+dfsg-16ubuntu6.7) ... Removing libreoffice-ogltrans (1:6.0.7-0ubuntu0.18.04.8) ... Removing libreoffice-impress (1:6.0.7-0ubuntu0.18.04.8) ... Removing libreoffice-draw (1:6.0.7-0ubuntu0.18.04.8) ... Removing libpagemaker-0.0-0:amd64 (0.0.4-1) ... Removing libproxy1-plugin-gsettings:amd64 (0.4.15-1) ... Removing libreoffice-avmedia-backend-gstreamer (1:6.0.7-0ubuntu0.18.04.8) ... Removing libreoffice-help-en-us (1:6.0.7-0ubuntu0.18.04.8) ... Removing libreoffice-writer (1:6.0.7-0ubuntu0.18.04.8) ... Removing libreoffice-calc (1:6.0.7-0ubuntu0.18.04.8) ... Removing libreoffice-base-core (1:6.0.7-0ubuntu0.18.04.8) ... Removing libreoffice-gnome (1:6.0.7-0ubuntu0.18.04.8) ... Removing libreoffice-gtk3 (1:6.0.7-0ubuntu0.18.04.8) ... Removing libreoffice-math (1:6.0.7-0ubuntu0.18.04.8) ... Removing ubuntu-standard (1.417.3) ... Removing lshw (02.18-0.1ubuntu6.18.04.1) ... Removing printer-driver-brlaser (4-1) ... Removing printer-driver-splix (2.0.0+svn315-6fakesync1) ... Removing thermald (1.7.0-5ubuntu2) ... Removing ubuntu-minimal (1.417.3) ... Removing vim-tiny (2:8.0.1453-1ubuntu1.1) ... Removing zeitgeist-core (1.0-0.1ubuntu1) ... Selecting previously unselected package ssh-import-id. (Reading database ... 126362 files and directories currently installed.) Preparing to unpack .../ssh-import-id_5.7-0ubuntu1_all.deb ... Unpacking ssh-import-id (5.7-0ubuntu1) ... Processing triggers for mime-support (3.60ubuntu1) ... Processing triggers for libreoffice-common (1:6.0.7-0ubuntu0.18.04.8) ... Processing triggers for desktop-file-utils (0.23-1ubuntu3.18.04.2) ... Processing triggers for cups (2.2.7-1ubuntu2.6) ... Updating PPD files for cups-filters ... Updating PPD files for foomatic-db-compressed-ppds ... Updating PPD files for openprinting-ppds ... Updating PPD files for c2esp ... Updating PPD files for foo2zjs-common ... Updating PPD files for gutenprint ... Updating PPD files for hpcups ... Updating PPD files for m2300w ... Updating PPD files for postscript-hp ... Updating PPD files for ptouch ... Updating PPD files for pxljr ... Updating PPD files for sag-gdi ... Processing triggers for libc-bin (2.27-3ubuntu1) ... Processing triggers for man-db (2.8.3-2ubuntu0.1) ... Processing triggers for gnome-menus (3.13.3-11ubuntu1.1) ... Processing triggers for dbus (1.12.2-1ubuntu1.1) ... Processing triggers for hicolor-icon-theme (0.17-2) ... Setting up ssh-import-id (5.7-0ubuntu1) ...
After that my Firefox was deleted despite the fact that it was running during the above operation. Well, I saw that some packages were going to be deleted but couldn't even imagine that Firefox was among them.
So the questions:
- Why command named
installwas about to delete something?
apt-getdecided that Firefox is no longer needed?
- How to use
apt-getso that it doesn't automatically delete the applications and packages that I need and don't want to delete?
- Where can I read about the topics connected to this issue?
Firefox was deleted. It was still working but after I closed it I couldn't start it again as it was no longer present in my applications. Then I reinstalled it (via Ubuntu Software application) and needed to adjust it from scratch as nothing of my previous settings preserved.
As asked in the comments:
$ apt-cache policy firefox firefox: Installed: (none) Candidate: 59.0.2+build1-0ubuntu1 Version table: 68.0.1+build1-0ubuntu0.18.04.1 -1 100 /var/lib/dpkg/status 59.0.2+build1-0ubuntu1 500 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
Oh, no! Seems VI was also removed:
$ sudo vi /etc/apt/sources.list sudo: vi: command not found $ which vi <nothing>
It worked before the discussed operation.
Suggested possible duplicate How do I restore the default repositories? doesn't answers the questions asked here. But it helped eliminate the root cause of the discussed problem. After enabling "Important security updates" and "Recommended updated" in tab "Updates" package installation problems ceased.
mook765 completely answered the question.