low disk space on "filesystem root"

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My system compalined of a low disk space on filesystem root.
Root consists of 50GB,
df -h showed an usage of 100%.

I did some cleaning, : dnf clean all, removed an kernel (there were three), removed a lot op files in /tmp and I ran Beachbit.

I have gained some room:

$ df -h
Filesystem                    Size  Used Avail Use% Mounted on
devtmpfs                      2.0G     0  2.0G   0% /dev
tmpfs                         2.0G  284K  2.0G   1% /dev/shm
tmpfs                         2.0G  9.6M  2.0G   1% /run
tmpfs                         2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/mapper/vg_cello-lv_root   50G   35G   13G  74% /
tmpfs                         2.0G   96K  2.0G   1% /tmp
/dev/sda5                     477M  147M  302M  33% /boot
/dev/mapper/vg_cello-lv_home  387G  165G  203G  45% /home
tmpfs                         396M   24K  396M   1% /run/user/42
tmpfs                         396M   28K  396M   1% /run/user/500

Still there is a lot inside root.
It seems that /var/cache consumes a lot of room: PackageKit and yum.

$ su -c "du --max-depth=1 -m -x /var/cache"
Password:
1    /var/cache/ccache
1    /var/cache/ldconfig
1    /var/cache/jwhois
17472    /var/cache/PackageKit
37    /var/cache/cups
1    /var/cache/hald
153    /var/cache/dnf
1    /var/cache/icecream
1    /var/cache/realmd
1    /var/cache/abrt-di
1    /var/cache/php-pear
1    /var/cache/libvirt
7    /var/cache/man
5597    /var/cache/yum
1    /var/cache/mock
1    /var/cache/app-info
1    /var/cache/httpd
6    /var/cache/fontconfig
1    /var/cache/foomatic
1    /var/cache/davfs2
1    /var/cache/gdm
1    /var/cache/ibus
1    /var/cache/krb5rcache
23271    /var/cache

Now I am not sure what to do. I want to delete unnecessary files. But here my knowledge of the filesystem ends. Probably a stupid question, but I am going to ask anyway; can I delete /var/cache/PackageKit, or will that ruin my system?


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