Ubuntu supports 4 GB memory and above solutions

The theoretical addressing space of the 32-bit Ubuntu system is 4 GB, but 3 GB is reserved for the kernel virtual space after 1 GB is deducted, and the addressing space occupied by devices such as video cards is deducted, the memory that your 32-bit Ubuntu system can actually use is less than 3 GB. I can identify 2.6 GB, which is related to the hardware configuration of each person. Some can recognize the range of 2.9G. How can we enable the Ubuntu system to support large memory? There are two solutions: 1. Enable the physical address extension (PAE) function in 32-Bit mode. When the addressing space is expanded from 32-bit to 36-bit, the applicable memory is equal to the power of 36 of 2 = 64 GB. However, the system will not be able to use the sleep function (sleep is different from standby ). It seems that there are other bugs. How to enable PAE is as follows: sudo apt-get install linux-generic-pae sudo apt-get install linux-headers-generic-pae sudo apt-get install nvidia-current nvidia-settings second, go straight to 64-bit Ubuntu. This is the best method, and there is basically no memory size limit. You can calculate the power of 2 to the power of 64. However, the only disadvantage is that the commonly used software is incompatible, and I decided to try 64-bit. Check the incompatibility issues. This article will be updated in the future to list the 64-bit Ubuntu incompatible software. I hope I don't even list one of them :) list of Ubuntu 64-bit software incompatibility 1. The supplement does not seem to be listed, linux and Windows are different. Most of the software has 32-bit and 64-bit versions. Even if there are no 64-bit versions, you only need to install a 32-bit library to solve the problem. If you use Linux, run to 64-bit.