Why Ubuntu 20.04 takes too much Boot-Time?

Asked by Navin Talati on 2021-06-02

Dear Sir,

I have Ubuntu 20.04 LTS and Win-10 each on seperate hard drives in my Desktop. Out of these Ubuntu 20.04 LTS takes too much time in booting. Say from screen of GNU-GRUB options to appearance of typical magenta Login & password Screen, it takes about 3 minutes ! This is not happening while I opt for Windows 10.

What may be the reason/s?

I surfed internet but could not find any solution for the about issue.
Please help me to resolve this issue.


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actionparsnip (andrew-woodhead666) said :

If you reboot, log in and then run:

dmesg -T > /tmp/boot.txt; gedit /tmp/boot.txt

You should see the times to boot, look for large gaps in time down the left side. This is the cause of the slowness

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Navin Talati (n-m-talati) said :

The command opens boot,txt file from temp.
It bears about 1290 entries. (It is too large to upload here in the thread)
Left side shows day, date,time and year.
... as for example..... (few are copied as under)

[Thu Jun 3 22:37:27 2021] Intel GenuineIntel
[Thu Jun 3 22:37:27 2021] AMD AuthenticAMD
[Thu Jun 3 22:37:27 2021] Hygon HygonGenuine
[Thu Jun 3 22:37:27 2021] Centaur CentaurHauls
[Thu Jun 3 22:37:27 2021] zhaoxin Shanghai

From this how it comes to know that which activity has taken how much time?
(Sir, may question may be silly, but actually I am a non-computer person and 'am unable to understand the significance in/of the output of command)

How to disable that activity? (some time it may create some other issue in the system if some activity is disabled)


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actionparsnip (andrew-woodhead666) said :

Read the left most column, as I said before. Look for large gaps in time. This is not a technical exercise. This is just reading times

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Daniel Letzeisen (dtl131) said :

This may help find slow startup processes too:
systemd-analyze blame

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