After upgrading CPU in Zorin OS showing only one core enabled out of four cores


I recently upgrade my CPU to i5-4570 from G3220 Pentium. but I got below result when checking for new CPU info

rama@laLiTH-RAM:~$ sudo lshw | grep core
          configuration: cores=4 enabledcores=1
          configuration: driver=hsw_uncore

Version: Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz
	Voltage: 1.0 V
	External Clock: 100 MHz
	Max Speed: 7000 MHz
	Current Speed: 3400 MHz
	Status: Populated, Enabled
	Upgrade: Other
	L1 Cache Handle: 0x0004
	L2 Cache Handle: 0x0005
	L3 Cache Handle: 0x0006
	Serial Number: Not Specified
	Asset Tag: Fill By OEM
	Part Number: Fill By OEM
	Core Count: 4
	Core Enabled: 1
		64-bit capable

can anyone tell me why it was showing only one core as enabled?

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These Problems are associated with grub, Reinstalling Grub may fix the Issue.

If you search enabling all cores in ubuntu on internet you can find guides like the one I attached and even videos, hope I could help, I'm not expert enough to tell you a fix by my experience :neutral_face:

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i've gone through articles like this but they are temporary, I'm looking for a native solution like re compiling kernel or updating grub as @anon6471198 said, thanks for responding

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thank you, i will try

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