I have a old wipro laptop around of 2008 2010. It used to window 7 but in horrible way. I decides switching to lubuntu 18.04 32bit version. When i tried it without installing it ran beautifully of laptop but after installation it got stuck at 640x480 resolution. When i used xrandr command it show xrandr failed to display driver or something. How to over come this?
Welcome to Ubuntu Discourse 
Your post was moved to its own topic for better support and because your issue has nothing to do with the topic where you posted originally.
It is almost always better to start your own topic when looking for help.
More importantly, Lubuntu 18.04 is no longer supported here and therefore you should consider upgrading immediately to a supported version.
You can find more information here:
Thanks
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Welcome to the community, adityaraj444 
It’s great to have you here.
As rubi1200 already mentioned, Lubuntu 18.04 is no longer supported, and because of that you may continue to face issues not only with display drivers, but also with updates, security, and application compatibility.
Regarding the screen resolution issue:
- Very old laptops (around 2008–2010) often use legacy graphics chips.
- After installation, the system may fail to load the proper graphics driver and fall back to a basic mode, which explains being stuck at 640×480.
- When
xrandrfails, it usually means that no working graphics driver is loaded.
Things you can try (with limited expectations):
lspci | grep -i vga
If the GPU is an old Intel chip, sometimes this helps:
sudo apt install xserver-xorg-video-intel
You can also check /var/log/Xorg.0.log for driver-related errors.
That said, even if the resolution issue is fixed, other problems are very likely due to the unsupported release. The best long-term solution would be to move to a currently supported lightweight distribution, which will give you better driver handling and overall stability.
Hope this helps, and welcome again to the community 
I’ve closed the question as per @rubi1200’s prior reply; ie. it’s outside of Support and Help rules on supported releases.
- lubuntu.me/bionic-eol/
- Extended Security Maintenance for Ubuntu 18.04 (Bionic Beaver) began on May 31, 2023
The oldest device I use in Quality Assurance testing for Lubuntu (and other releases) is actually from 2007, and it’ll run all currently released products, as do other devices I have from ~2008.
The only 32-bit architecture still supported by Ubuntu is the ARM (armhf), though i386 (32-bit x86) is supported a secondary architecture (ie. amd64 or a 64-bit install can also use i386 packages/binaries).
If you’re using your 18.04 system offline (and thus can ignore security/safety given your system is EOL), I’d work out what you’re using for starters, as Lubuntu 18.04 LTS was released with 2 installers, and 7 different ISOs where 3 used the GA kernel (2 installers available) & the rest used HWE kernel & were only available a single installer.
The importance of kernel stack is it dictates kernel modules, which are commonly called drivers… and some older hardware did benefit from the older GA stack, whilst other wasn’t was equal with both, though some also preferred HWE but that was usually newer hardware than yours. You only specified 18.04 and not which kernel stack you used (set by install media as Lubuntu provided many). Refer to documentation for help on this, as we haven’t supported that release in years.
We can help you if you use a supported release, but Lubuntu 18.04 LTS isn’t supported as already stated sorry.