Eu estava instalando o edubuntu-artwork no ubuntu 17.04, ocorre erro e agora nada está funcionando. Terminal mostra
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
breathe-icon-theme edubuntu-wallpapers elementary-icon-theme
human-icon-theme
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
edubuntu-artwork
The following packages will be upgraded:
gir1.2-javascriptcoregtk-4.0 gir1.2-webkit2-4.0 libjavascriptcoregtk-4.0-18
libwebkit2gtk-4.0-37
4 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 15.3 MB of archives.
After this operation, 1,465 kB disk space will be freed.
Do you want to continue? [Y/n] y
Get:1 http://archive.ubuntu.com/ubuntu artful-security/main amd64 libwebkit2gtk-4.0-37 amd64 2.18.3-0ubuntu0.17.10.1 [11.2 MB]
Get:2 http://archive.ubuntu.com/ubuntu artful-security/main amd64 libjavascriptcoregtk-4.0-18 amd64 2.18.3-0ubuntu0.17.10.1 [4,054 kB]
Get:3 http://archive.ubuntu.com/ubuntu artful-security/main amd64 gir1.2-webkit2-4.0 amd64 2.18.3-0ubuntu0.17.10.1 [67.7 kB]
Get:4 http://archive.ubuntu.com/ubuntu artful-security/main amd64 gir1.2-javascriptcoregtk-4.0 amd64 2.18.3-0ubuntu0.17.10.1 [20.9 kB]
Fetched 15.3 MB in 12s (1,258 kB/s)
(Reading database ... 162170 files and directories currently installed.)
Removing edubuntu-artwork (15.12.1) ...
/var/lib/dpkg/info/edubuntu-artwork.postrm: 31: /var/lib/dpkg/info/edubuntu-artwork.postrm: update-gconf-defaults: not found
dpkg: error processing package edubuntu-artwork (--remove):
subprocess installed post-removal script returned error exit status 127
Errors were encountered while processing:
edubuntu-artwork
E: Sub-process /usr/bin/dpkg returned an error code (1)