$ uname -a
Linux cs-771133650849-default-boost-j25gz 5.4.104+ #1 SMP Fri Apr 30 09:52:02 PDT 2021 x86_64 GNU/Linux
...
$ apt-get install irssi
********************************************************************************
You are running apt-get inside of Cloud Shell. Note that your Cloud Shell
machine is ephemeral and no system-wide change will persist beyond session end.
To suppress this warning, create an empty ~/.cloudshell/no-apt-get-warning file.
The command will automatically proceed in 5 seconds or on any key.
Visit https://cloud.google.com/shell/help for more information.
********************************************************************************
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
...
$ sudo su
root@cs-771133650849-default-boost-j25gz:/home/catalinfest# apt-get install irssi
********************************************************************************
You are running apt-get inside of Cloud Shell. Note that your Cloud Shell
machine is ephemeral and no system-wide change will persist beyond session end.
To suppress this warning, create an empty ~/.cloudshell/no-apt-get-warning file.
The command will automatically proceed in 5 seconds or on any key.
Visit https://cloud.google.com/shell/help for more information.
********************************************************************************
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
irssi-scripts
The following NEW packages will be installed:
irssi
0 upgraded, 1 newly installed, 0 to remove and 7 not upgraded.
Need to get 1,177 kB of archives.
After this operation, 2,910 kB of additional disk space will be used.
Get:1 http://deb.debian.org/debian buster/main amd64 irssi amd64 1.2.0-2 [1,177 kB]
Fetched 1,177 kB in 0s (14.7 MB/s)
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package irssi.
(Reading database ... 116563 files and directories currently installed.)
Preparing to unpack .../irssi_1.2.0-2_amd64.deb ...
Unpacking irssi (1.2.0-2) ...
Setting up irssi (1.2.0-2) ...
Processing triggers for man-db (2.8.5-2) ...
...
# exit
exit
$ irssi
[1]+ Stopped irssi