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$ sudo lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.2 LTS
Release:	20.04
Codename:	focal

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sudo apt-get install note

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$ note
Can't locate YAML.pm in @INC (you may need to install the YAML module) (@INC contains: /usr/bin/.. blib/lib /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.30.0 /usr/local/share/perl/5.30.0 /usr/lib/x86_64-linux-gnu/perl5/5.30 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.30 /usr/share/perl/5.30 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/bin/note line 40.
BEGIN failed--compilation aborted at /usr/bin/note line 40.

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$ sudo apt-get install libyaml-perl 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  libyaml-libyaml-perl
Suggested packages:
  libyaml-shell-perl
The following NEW packages will be installed:
  libyaml-libyaml-perl libyaml-perl
0 upgraded, 2 newly installed, 0 to remove and 34 not upgraded.
Need to get 86.6 kB of archives.
After this operation, 272 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://mirrors.aliyun.com/ubuntu focal/main amd64 libyaml-libyaml-perl amd64 0.81+repack-1 [28.5 kB]
Get:2 http://mirrors.aliyun.com/ubuntu focal/main amd64 libyaml-perl all 1.30-1 [58.2 kB]
Fetched 86.6 kB in 0s (224 kB/s)      
Selecting previously unselected package libyaml-libyaml-perl.
(Reading database ... 123869 files and directories currently installed.)
Preparing to unpack .../libyaml-libyaml-perl_0.81+repack-1_amd64.deb ...
Unpacking libyaml-libyaml-perl (0.81+repack-1) ...
Selecting previously unselected package libyaml-perl.
Preparing to unpack .../libyaml-perl_1.30-1_all.deb ...
Unpacking libyaml-perl (1.30-1) ...
Setting up libyaml-libyaml-perl (0.81+repack-1) ...
Setting up libyaml-perl (1.30-1) ...
Processing triggers for man-db (2.9.1-1) ...