Where does half of the disk space go?

Question

LVM

I create a virtual machine, allocate 70 GB for hdd. I install Ubuntu 20.04, the layout is automatic.

On the installed host, for some reason only half is displayed

df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               7.8G     0  7.8G   0% /dev
tmpfs                              1.6G  1.4M  1.6G   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   63G   35G   25G  59% /
tmpfs                              7.9G     0  7.9G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
tmpfs                              7.9G     0  7.9G   0% /sys/fs/cgroup
/dev/loop0                          56M   56M     0 100% /snap/core18/2128
/dev/loop2                          56M   56M     0 100% /snap/core18/2344
/dev/loop3                          44M   44M     0 100% /snap/snapd/15177
/dev/loop1                          62M   62M     0 100% /snap/core20/1405
/dev/loop4                          71M   71M     0 100% /snap/lxd/21029
/dev/sda2                          1.5G  106M  1.3G   8% /boot
/dev/loop5                          68M   68M     0 100% /snap/lxd/22753
tmpfs                              1.6G     0  1.6G   0% /run/user/1000
/dev/loop6                          45M   45M     0 100% /snap/snapd/15534

Where did everything else go?

Answer 1

63G /
1.5G /boot
I suppose, there is also a swap partition, only df does not show it (run the swapon command without arguments to see the size of the swap)
Moreover, it is not clear whether 70 GB or 70 GiB were allocated
1000*1000*1000*70 == 1024*1024*1024*65.192580223
So no, there's nothing left even for swap, just 0.5G on EFI and everything converges to zero.

Answer 2

все нормально
size = 63G вполне близко к выделенным 70 гб.

Answer 3

Куда делось все остальное?

Запусти ncdu, увидишь размер папок, там будет подробно указано какие папки подпапки сколько занимают.