В букварях не все буквы есть.
Только что
sudo apt-get -y install doublecmd-gtk
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages will be REMOVED:
doublecmd-qt
The following NEW packages will be installed:
doublecmd-gtk
0 upgraded, 1 newly installed, 1 to remove and 205 not upgraded.
Need to get 5 062 kB of archives.
After this operation, 60,4 kB of additional disk space will be used.
Get:1
http://archive.ubuntu.com/ubuntu jammy/universe amd64 doublecmd-gtk amd64 1.0.5-1 [5 062 kB]
Fetched 5 062 kB in 1s (3 626 kB/s)
(Reading database ... 354611 files and directories currently installed.)
Removing doublecmd-qt (1.0.5-1) ...
Selecting previously unselected package doublecmd-gtk.
(Reading database ... 354602 files and directories currently installed.)
Preparing to unpack .../doublecmd-gtk_1.0.5-1_amd64.deb ...
Unpacking doublecmd-gtk (1.0.5-1) ...
Setting up doublecmd-gtk (1.0.5-1) ..
Только забыл убрать -y - и убрался doublecmd-gtk
ЗЫ
Не заметил, что 18.04... А зачем такое старое?