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I work in Ubuntu 22 on VirtualBox. /dev/sda3 is almost full:

df -h --total
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           720M  1,6M  718M   1% /run
/dev/sda3        24G   23G  411M  99% /
tmpfs           3,6G     0  3,6G   0% /dev/shm
tmpfs           5,0M  4,0K  5,0M   1% /run/lock
/dev/sda2       512M  6,1M  506M   2% /boot/efi
tmpfs           720M  124K  720M   1% /run/user/1000
total            30G   23G  5,9G  80% -

I have cleared unused linux kernels following How do I free up more space in /boot? which freed only 1%. What else can I do?

I added additional GBs to my virtual hard disk and with GParted added ample GBs to /dev/sda2.

df -h --total now reads

Filesystem      Size  Used Avail Use% Mounted on
tmpfs           720M  1,6M  718M   1% /run
/dev/sda3        25G   23G  115M 100% /
tmpfs           3,6G     0  3,6G   0% /dev/shm
tmpfs           5,0M  4,0K  5,0M   1% /run/lock
/dev/sda2        11G  6,1M   11G   1% /boot/efi
tmpfs           720M  116K  720M   1% /run/user/1000
total            40G   23G   16G  60% -

Nevertheless I still get an error message "Low Disk Space on "Filesystem root".

enter image description here

What is wrong?

Viesturs
  • 652
  • Kernels should be on the boot partition, /dev/sda2, in your case. Uninstall stuff or delete large files to free space. – mikewhatever May 26 '23 at 15:27
  • @mikewhatever it is a fresh Ubuntu installation, not much installed. Should I increase the size of the virtual disk? – Viesturs May 26 '23 at 15:37
  • Unless I’m missing something, /dev/sda2 looks fine with only 1% in use. But /dev/sda3 is almost full. – mpboden May 30 '23 at 15:47
  • @mpboden, I will repartition the virtual hard disk. What is the optimum size of /dev/sda2? – Viesturs May 30 '23 at 15:50
  • Again, I don’t see a problem with sda2. Why do you think you need to resize it? – mpboden May 30 '23 at 16:19
  • @mpboden isn't there too much memory allocated to /dev/sda2. I will transfer memory from sda2 to sda3. – Viesturs May 30 '23 at 16:30
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    Are you confusing the difference between /boot on sda2 and the root directory / on sda3? 1Gb is more than sufficient for the /boot directory on sda2. You initially had 500mb and that was fine as well. Your root directory on sda3 is full. So you need to look there and find out what is taking up so much space or allocate more to sda3. – mpboden May 30 '23 at 16:45
  • @mpboden I moved memory from /dev/sda2 to /dev/sda3. Now the error message no longer appears. – Viesturs May 31 '23 at 10:21

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