I recently installed Ubuntu and it's pretty slow on my machine: 12GB memory, 96GB SSD (where the OS run") and 1TB HDD I've only installed anaconda-navigator and some extensions... nothing at all, so I can't understand why it is this slow!

Here's a disk analyzer capture of the HDD: HDD disk analyzed

Is it ok to have only 3.5GB used on 977GB with 88151 items (which seems a lot to me)? And what about the picture? Why is it this much red?

Here's a disk analyzer capture of the SSD: SSD disk analyzed

Same questions here. /usr seems so full with only 7.7GB on 96GB

I attach also df -h

Filesystem      Size  Used Avail Use% Mounted on
udev            5.8G     0  5.8G   0% /dev
tmpfs           1.2G  9.6M  1.2G   1% /run
/dev/sdb1        87G  9.1G   74G  12% /
tmpfs           5.9G  115M  5.7G   2% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           5.9G     0  5.9G   0% /sys/fs/cgroup
/dev/sda1       916G  4.0G  866G   1% /mnt/data
tmpfs           1.2G   12M  1.2G   1% /run/user/1000

PS. Why do I have only 916GB if the hard disk is 1T? I know about the loss from decimal to binary measuring and about hidden features but in my last OS I had like 977GB so I did I lost more space?

This questions may be found useful to newbie like me, so please try to explain me if it's normal or if I have to do something while I install programs or to keep disk clean

  • Only Ubuntu and official flavors of Ubuntu (ubuntu.com/download/flavours) are on-topic here, refer to askubuntu.com/help/on-topic where you'll find other SE sites where you question will be welcome. FYI: Questions asking for opinions are also off-topic here, this isn't a forum (Ubuntu Forums provides that service)
    – guiverc
    Mar 13, 2021 at 10:53
  • 2
    I noticed you changed your question from Debian to Ubuntu after the comment by guiverc. Please edit your question to indicate which version of Ubuntu you are using.
    – 24601
    Mar 13, 2021 at 11:07

1 Answer 1


Try playing the following commands...

lsb_release -a

sudo hdparm -I /dev/sd* | grep -i trim

sudo lshw -C memory

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