Thanks for the solution. I removed "nomodeset" from grub config and now
it detects external monitor.
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https://bugs.launchpad.net/bugs/1961596
Title:
Ubuntu 20.04 with kernel version
External monitors can't be detected because you have disabled the
graphics driver. You need to remove the 'nomodeset' kernel parameter.
** Package changed: xorg (Ubuntu) => linux-hwe-5.11 (Ubuntu)
** Changed in: linux-hwe-5.11 (Ubuntu)
Status: New => Invalid
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