1. Ubuntu Partition expansion
2. Apache2 https settings
3. Ubuntu 20.04 For Let's Note: Brightness setting with Fn+F1/F2.
   1. Open /etc/default/grub
   2. GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=video acpi_osi=!!"
   3. $sudo update-grub
4. Use openvpn3 on Ubuntu 18.04.
5. Speed up Ubuntu 18.04
6. Some useful Tips.
   • SSH via openvpn on Android Device.
   • mount casper-rw by $ sudo mount -o loop /media/casper-rw /tmp/casper/
   • Ubuntu 18.04. Window Manager restarts by ALT+F2 and then r and ENTER.
   • Ubuntu 14.04. Workspace switcher freezes: it is "unfreezed" by ALT+ESC.
7. quick setup for an environment of website developmentI built a website development environment so many time due to many errors above, I made a quick memo for myself and even I made a quick shell script for a quick setup for such an environment.
8. Ubuntu 14.04LTS installation disk on 4GB Toshiba pendrive. How I reached this solution. I have made try and errors.
9. Backup windows Recovery partition /dev/sdc1 and install ubuntu in the partition

I have been using unix system for a website development. Here is an explanation for setting up a ubuntu system for a website development.

Here is my important requirement.

1. Website development should be on a unix system; because I use apache2, subversion on ssh and emacs, which are quite unix origin and unix dependent.
2. It should be performed in a various environment, i.e. basically any shared computer, if bootable from a pendrive.

History of my attempts:

1. I mainly use shared computers. (I have my own laptop but the power is quite limited. When I am browsing on chrome and watching the medical lecutre, since I am a medical student, it becomes very slow. That is why I use two computers, one for medical study and the other for website development at the same time.
2. A long time ago, I gave a try on VirtualBox, which turned out to be good. But I eventually found that it is a bit too slow.

I tried a pendrive installation of ubuntu. It worked quite fine as expected in the first run, which turned out to be a mere luck. Anyway this become a very good experience for me and decided to have a website development environment on a pendrive. It worked on my laptop computer and also some shared PCs, which are really good.

I chose a pendrive bootdable with ubuntu. It was not that easy, but I finally reached this solution; Ubuntu 14.04LTS installation disk on 4GB Toshiba pendrive.