xterm is a false positive component-mismatch (MIR), as tk8.6 "Recommends: xterm | x-terminal-emulator" and x-terminal-emulator is provided by "gnome-terminal" in Ubuntu "main" already.
https://git.launchpad.net/ubuntu/+source/tk8.6/tree/debian/control#n20
$ apt install x-terminal-emulator Reading package lists... Done Building dependency tree... Done Reading state information... Done Package x-terminal-emulator is a virtual package provided by: xterm:i386 372-1ubuntu1 xterm 372-1ubuntu1 xiterm+thai 1.10-2build1 xfce4-terminal 0.8.10-1 tilix 1.9.4-2build1 termit 3.1-1 terminology 1.12.1-1 terminator 2.1.1-1 stterm 0.8.4-1 sakura 3.8.4-1 rxvt-unicode 9.30-2build1 qterminal 0.17.0-0ubuntu1 pterm 0.76-2 mlterm-tiny 3.9.0-1build1 mlterm 3.9.0-1build1 mate-terminal 1.26.0-1ubuntu2 lxterminal 0.4.0-2 lilyterm 0.9.9.4+git20150208.f600c0-5build1 konsole 4:21.12.3-0ubuntu1 kitty 0.21.2-1build1 eterm 0.9.6-6.1 deepin-terminal 5.2.11-1build1 cool-retro-term 1.2.0+ds-5 gnome-terminal 3.44.0-1ubuntu1 You should explicitly select one to install.
E: Package 'x-terminal-emulator' has no installation candidate
xterm is a false positive component-mismatch (MIR), as tk8.6 "Recommends: xterm | x-terminal- emulator" and x-terminal-emulator is provided by "gnome-terminal" in Ubuntu "main" already.
https:/ /git.launchpad. net/ubuntu/ +source/ tk8.6/tree/ debian/ control# n20
$ apt install x-terminal-emulator git20150208. f600c0- 5build1
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package x-terminal-emulator is a virtual package provided by:
xterm:i386 372-1ubuntu1
xterm 372-1ubuntu1
xiterm+thai 1.10-2build1
xfce4-terminal 0.8.10-1
tilix 1.9.4-2build1
termit 3.1-1
terminology 1.12.1-1
terminator 2.1.1-1
stterm 0.8.4-1
sakura 3.8.4-1
rxvt-unicode 9.30-2build1
qterminal 0.17.0-0ubuntu1
pterm 0.76-2
mlterm-tiny 3.9.0-1build1
mlterm 3.9.0-1build1
mate-terminal 1.26.0-1ubuntu2
lxterminal 0.4.0-2
lilyterm 0.9.9.4+
konsole 4:21.12.3-0ubuntu1
kitty 0.21.2-1build1
eterm 0.9.6-6.1
deepin-terminal 5.2.11-1build1
cool-retro-term 1.2.0+ds-5
gnome-terminal 3.44.0-1ubuntu1
You should explicitly select one to install.
E: Package 'x-terminal- emulator' has no installation candidate