$ cat /etc/apt/sources.list
# Automatically generated by Calamares on 2020-03-26.
# Lines starting with "deb" are mandatory, while lines starting with "deb-src"
# are for more detailed package information.
## See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
## newer versions of Lubuntu.
deb http://mirrors.nju.edu.cn/ubuntu/ focal main restricted
## Major bug fix updates produced after the final release of Lubuntu.
## Have you noticed a regression? Please report it!
## https://wiki.ubuntu.com/StableReleaseUpdates#Regressions
deb http://mirrors.nju.edu.cn/ubuntu/ focal-updates main restricted
## Software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu team.
## Also, please note that software in Universe WILL NOT receive any review or
## updates from the Ubuntu security team directly. Updates in this repository
## are provided by volunteers, but most come from Debian.
deb http://mirrors.nju.edu.cn/ubuntu/ focal universe
deb http://mirrors.nju.edu.cn/ubuntu/ focal-updates universe
## Software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu team,
## and may not be under a free licence. Please satisfy yourself as your rights
## to use the software. Also, please note that software in Multiverse WILL NOT
## receive any review or updates from the Ubuntu security team directly.
deb http://mirrors.nju.edu.cn/ubuntu/ focal multiverse
deb http://mirrors.nju.edu.cn/ubuntu/ focal-updates multiverse
## Software from this repository contains tested security updates from the
## Ubuntu security team.
deb http://mirrors.nju.edu.cn/ubuntu/ focal-security main restricted
deb http://mirrors.nju.edu.cn/ubuntu/ focal-security universe
deb http://mirrors.nju.edu.cn/ubuntu/ focal-security multiverse
## Software from this repository may not have been tested as extensively as
## software contained in the main release, although it includes newer versions
## of some applications which may provide useful features. Also, please note
## that software in Backports WILL NOT receive any review or updates from the
## Ubuntu security team.
## Uncomment the following two lines to add software from Canonical's
## "partner" repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu focal partner
# deb-src http://archive.canonical.com/ubuntu eoan partner
$ ls /etc/apt/sources.list.d
librecad-dev-ubuntu-librecad-stable-eoan.list librecad-dev-ubuntu-librecad-stable-eoan.list.save
librecad-dev-ubuntu-librecad-stable-eoan.list.distUpgrade
$ cat /etc/apt/sources.list.d/*.list
$ apt list | grep "installé, local"
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
geda-doc/now 1:1.8.2-11 all [installé, local]
geda-examples/now 1:1.8.2-11 all [installé, local]
geda-gattrib/now 1:1.8.2-11 amd64 [installé, local]
geda-gnetlist/now 1:1.8.2-11 amd64 [installé, local]
geda-gschem/now 1:1.8.2-11 amd64 [installé, local]
geda-gsymcheck/now 1:1.8.2-11 amd64 [installé, local]
geda-symbols/now 1:1.8.2-11 all [installé, local]
geda-utils/now 1:1.8.2-11 amd64 [installé, local]
geda/now 1:1.8.2-11 all [installé, local]
gspiceui/now 1.1.00+dfsg-2 amd64 [installé, local]
jacksum/now 1.7.0-4.1 all [installé, local]
libgdal20/now 2.4.2+dfsg-1build2 amd64 [installé, local]
libgdcm2.8/now 2.8.8-9ubuntu4 amd64 [installé, local]
libgeda-common/now 1:1.8.2-11 all [installé, local]
libgeda42/now 1:1.8.2-11 amd64 [installé, local]
libgeotiff2/now 1.4.3-1 amd64 [installé, local]
libilmbase23/now 2.2.1-2ubuntu1 amd64 [installé, local]
libnetcdf13/now 1:4.6.2-1build1 amd64 [installé, local]
libopencv-calib3d3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-contrib3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-core3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-features2d3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-flann3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-highgui3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-imgcodecs3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-imgproc3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-ml3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-objdetect3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-photo3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-shape3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-stitching3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-superres3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-video3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-videoio3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-videostab3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopencv-viz3.2/now 3.2.0+dfsg-6 amd64 [installé, local]
libopenexr23/now 2.2.1-4.1ubuntu1.2 amd64 [installé, local]
libpoppler90/now 0.80.0-0ubuntu1.1 amd64 [installé, local]
libprocps7/now 2:3.3.15-2ubuntu3 amd64 [installé, local]
libproj13/now 5.2.0-1 amd64 [installé, local]
libwxgtk3.0-0v5/now 3.0.4+dfsg-12 amd64 [installé, local]
linux-headers-5.3.0-64-generic/now 5.3.0-64.58 amd64 [installé, local]
linux-headers-5.3.0-64/now 5.3.0-64.58 all [installé, local]
linux-image-5.3.0-64-generic/now 5.3.0-64.58 amd64 [installé, local]
linux-modules-5.3.0-64-generic/now 5.3.0-64.58 amd64 [installé, local]
linux-modules-extra-5.3.0-64-generic/now 5.3.0-64.58 amd64 [installé, local]
linux-signed-generic/now 5.3.0.64.54 amd64 [installé, local]
wine-stable-amd64/now 5.0.1~eoan amd64 [installé, local]
wine-stable-i386/now 5.0.1~eoan i386 [installé, local]
wine-stable/now 5.0.1~eoan amd64 [installé, local]
winehq-stable/now 5.0.1~eoan amd64 [installé, local]
xpdf/now 3.04-13ubuntu4 amd64 [installé, local]
Pour info, en important directement le fichier "CImg.h", avec les quelques arguments adéquates, le projet se compile.
g++ -Wall -I./include cimg_first_app.cpp -o cimg_first_app -lpthread -lX11
(source ;
https://cimg.eu/reference/group__cimg__overview.html)