Dual boot — this is when two operating systems are installed on a computer
Hello, school students. Initially, you will be practicing with Linux on a virtual machine. Therefore, this topic is not for you. But I insist that you install Ubuntu as your main OS as early as possible and work exclusively within it.
This does not apply to MacBooks owners. I’m not sure what to recommend here. macOS is not something I want to touch — you can find similar commands in zsh or bash on this OS. But it won’t be a replacement for Ubuntu.
Previously, Ubuntu was comfortable. It behaved predictably. But now it has the same flaws as Windows. For example, a window may suddenly pop up asking you to install updates — right at the moment when you were about to press Enter 
Another inconvenience is the time synchronization issue between Ubuntu and Windows. Automatic synchronization may not occur immediately after login, so this issue needs to be resolved.> A time lag of a few hours is critical. Not all websites can operate properly, and even requests may not be processed. For example, a browser request to Comet will remain without a response.
The time in Windows lags by N hours due to differences in how hardware clocks (RTC) are interpreted. Ubuntu defaults to UTC, while Windows uses local time (e.g., Europe/Samara, UTC+4). To synchronize them, configure Ubuntu to use local time or enable automatic synchronization in both OSes.
Setting up in Ubuntu
Strictly speaking, you can shift the time in any OS, but it is not recommended to work in UTC in Windows due to poor software compatibility. Therefore, make the change in Ubuntu as shown below.
Run the following command in the terminal to switch the RTC to local time:
sudo timedatectl set-local-rtc 1
Reboot and check the time in Windows — it should now match without adjustments.