I install Claude Code for the very first time, I use a voucher provided from a friend to use it 7 days for free with the USD $18 / month, although there is a Free Subscription you can use.
I donwload and install it on Windows 11 and I start to used it immediately with an incipient Symfony PHP Docker nginx Linux project.
I show you how I combine it with PHPStorm, how I use the Working Tree and the Pull Request (PR) and the problems I find when I request functionalities.
A video as an introduction to Junie, showing the creation of a web project from zero, with Junie IA agent.
The subscription I used is $20 USD per month.
A Symfony 7.4 with PHP 8.5 in a Docker Container with Ubuntu 26.04 LTS is requested.
Junie creates the solution with Ubuntu 24.04 LTS and Symfony 7.1 and PHP 8.3, so I instruct it to fix it.
The video shows some errors created by the agent, and how to make it correct them.
So I show here how I launched a fresh Ubuntu 24.04 in Google Cloud, on 2026-05-04, and demostrate the exploit of escalation privileges Copy Fail (CVE-2026-31431) which allows you to become root from a regular user account in almost any Linux since year 2017.
It consists in the execution of a Python 3 code, which is only 732 bytes.
I show how I fixed it by upgrading the kernel and rebooting.
Here you can see the original tweet I saw: https://x.com/DarkWebInformer/status/2049579219190165658?s=20
And access the code: https://github.com/theori-io/copy-fail-CVE-2026-31431
I also tried on a fresh deployed Ubuntu 26.04 LTS and it was not affected by the exploit.
This video shows real example of my workflow, in real time, on how I programmed with Google Antigravity some new features, like adding discount coupons, for my commercial web project for quickly audio conversion https://audioconverter.carlesmateo.com/
I show some problems when working with Gemini 3 Flash, and how I instructed the IA to fix them.
How to schedule snapshots for your instances in Google Cloud.
Be aware that snapshots may be scheduled automatically, and daily, by Google.
You may want to schedule weekly snapshots to be retained for 90 days or similar.
If you are running your instances in Google Gloud Compute Engine and you want to increase the size of the Disk without having to reboot, this video explains step by step how you can do it.
I show some tips and tricks.
A step by step guide, with some tricks and troubleshot.
I show in the video, how briefly after using sudo, it stops working.
I did this proof of concept and, I got the same problem:
sleep 300 && sudo cat /etc/lsb-release
Checking with:
id -nG
clearly showed that my user is part of google-sudoers But then:
journalctl -u google-guest-agent -f
Displays:
Apr 26 17:54:07 ubuntu26-04 google_guest_agent[851]: Adding existing user carles_mateo to google-sudoers group.
Apr 26 17:54:07 ubuntu26-04 gpasswd[89648]: user carles_mateo added by root to group google-sudoers
Apr 26 17:54:07 ubuntu26-04 google_guest_agent[851]: Updating keys for user carles_mateo.
Apr 26 17:54:11 ubuntu26-04 google_guest_agent[851]: Updating keys for user carles_mateo.
Apr 26 17:57:11 ubuntu26-04 google_guest_agent[851]: ERROR non_windows_accounts.go:219 invalid ssh key entry - expired key: carles_mateo:...google-ssh {"userName":"carles.mateo@gmail.com","expireOn":"2026-04-26T17:57:05+0000"}
Apr 26 17:57:11 ubuntu26-04 google_guest_agent[851]: ERROR non_windows_accounts.go:219 invalid ssh key entry - expired key: carles_mateo:ssh-rsa...
Apr 26 17:57:11 ubuntu26-04 google_guest_agent[851]: Removing user carles_mateo.
Apr 26 17:57:11 ubuntu26-04 gpasswd[89736]: user carles_mateo removed by root from group google-sudoersThe video shows step by step how to create an Instance in Google Cloud Compute Engine of the type e2, increase the size of the disk, and install Ubuntu 26.04 LTS Server.
Also shows how the new htop looks, with new IO options.
You know that utilites from coreutils have been rewriten in Rust, like sudo. I was wondering if it would work well. I thoguht I was encountering the first problems, after I experienced that when launched sudo, like in example, a sudo apt install package , sudo then stops working and I’ve to exit the shell and relogin.
I found that it is Google Cloud that removes my user from google-sudoers after 3 minutes.