[PRO] Ubuntu 18.04 LTS OS: Dual Multi Version Package From Multi Source Packages

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This way, help you dual|multi version package/app,..lib in your linux, ubuntu, linux mint, elementary,... if them same source list.
#Some downgrade, old package,...
E: Unable to locate package ...
E: Couldn't find any package by glob ...
E: Couldn't find any package by regex ...
#########
#1: edit source (*.list | /etc/apt):
file name: *.list
1 source = deb http://us.archive.ubuntu.com/ubuntu/ xenial main
#####################33
#2: check version of package
$apt-cache policy [package]
eg: $apt-cache policy openshot
openshot:
Installed: 2.4.1-2
Candidate: 2.4.1-2
Version table:
*** 2.4.1-2 500
500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
500 http://archive.ubuntu.com/ubuntu bionic/universe i386 Packages
100 /var/lib/dpkg/status
1.4.3-1.2 500
500 http://th.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
500 http://th.archive.ubuntu.com/ubuntu xenial/universe i386 Packages
###########
#3: Downgrade package with aptitude
Install aptitude: $sudo apt install aptitude
Install old package with version: $sudo aptitude install [pkg]=[version]
Eg: $sudo aptitude install openshot=1.4.3-1.2
and wait.. done.
################
#4: Lock package version | keep specific versions of packages installed
Open synaptic(install synaptic:$sudo apt install synaptic)
Find/Select package
Menu/Package/Lock Version.
Done
#Goodluck.







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