I found the problem. When I updated the template I uninstalled Thunderbird, and the qubes-usb-proxy and other related tools are considered unused dependencies. I think that this is a bug in the template. I solved the issue installing the necessary packages.
$ sudo dnf remove thunderbird Dependencies resolved. ============================================================================================== Package Arch Version Repository Size ============================================================================================== Removing: thunderbird x86_64 52.4.0-2.fc26 @updates 157 M Removing dependent packages: python-backports-ssl_match_hostname noarch 3.5.0.1-4.fc26 @fedora 18 k python2-crypto x86_64 2.6.1-14.fc26 @fedora 2.2 M python2-cryptography x86_64 2.0.2-2.fc26 @updates 2.6 M python2-jinja2 noarch 2.9.6-1.fc26 @fedora 3.6 M python2-pyOpenSSL noarch 16.2.0-6.fc26 @updates 523 k python2-requests noarch 2.13.0-1.fc26 @fedora 409 k python2-tornado x86_64 4.4.2-3.fc26 @fedora 3.9 M python2-urllib3 noarch 1.20-1.fc26 @fedora 536 k python2-zmq x86_64 16.0.2-3.fc26 @fedora 1.6 M qubes-mgmt-salt-vm-connector noarch 3.2.5-1.fc26 @qubes-builder-vm-r3.2-current-testing 4.7 k qubes-vm-recommended noarch 3.2.3-1.fc26 @qubes-builder-vm-r3.2-current-testing 0 salt noarch 2017.7.2-1.fc26 @updates 36 M salt-ssh noarch 2017.7.2-1.fc26 @updates 3.0 k thunderbird-qubes x86_64 1.2.9-1.fc26 @qubes-builder-vm-r3.2-current-testing 11 k zeromq x86_64 4.1.6-3.fc26 @fedora 671 k Removing unused dependencies: PyYAML x86_64 3.12-3.fc26 @fedora 646 k dnf-utils noarch 2.1.5-1.fc26 @updates 3.8 k libtomcrypt x86_64 1.17-31.20160123git912eff4.fc26 @updates 824 k libtommath x86_64 1.0-8.fc26 @updates 106 k libyaml x86_64 0.1.7-2.fc26 @fedora 121 k openpgm x86_64 5.2.122-8.fc26 @fedora 317 k python-backports x86_64 1.0-9.fc26 @fedora 638 python-chardet noarch 2.3.0-3.fc26 @fedora 1.1 M python-enum34 noarch 1.1.6-1.fc26 @fedora 232 k python-ipaddress noarch 1.0.16-4.fc26 @fedora 227 k python2-asn1crypto noarch 0.23.0-1.fc26 @updates 924 k python2-babel noarch 2.3.4-5.fc26 @fedora 20 M python2-backports_abc noarch 0.5-3.fc26 @fedora 30 k python2-futures noarch 3.1.1-1.fc26 @fedora 91 k python2-idna noarch 2.5-1.fc26 @fedora 563 k python2-markupsafe x86_64 0.23-13.fc26 @fedora 83 k python2-msgpack x86_64 0.4.8-3.fc26 @fedora 272 k python2-pysocks noarch 1.6.7-1.fc26 @updates 79 k python2-singledispatch noarch 3.4.0.3-7.fc26 @fedora 46 k python2-systemd x86_64 234-1.fc26 @fedora 262 k pytz noarch 2016.10-4.fc26 @fedora 185 k qubes-core-vm-doc noarch 3.2.20-1 @qubes-builder-vm-r3.2-current-testing 2.2 k qubes-gpg-split x86_64 2.0.26-1.fc26 @qubes-builder-vm-r3.2-current-testing 59 k qubes-img-converter x86_64 1.2.3-1.fc26 @qubes-builder-vm-r3.2-current-testing 6.5 k qubes-input-proxy-sender x86_64 1.0.10-1.fc26 @qubes-builder-vm-r3.2-current-testing 18 k qubes-pdf-converter x86_64 2.1.2-1.fc26 @qubes-builder-vm-r3.2-current-testing 15 k qubes-usb-proxy noarch 1.0.11-1.fc26 @qubes-builder-vm-r3.2-current-testing 7.7 k Transaction Summary ============================================================================================== Remove 43 Packages Freed space: 235 M Is this ok [y/N]: -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to qubes-users@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/95ef8fbf-89ad-411b-b099-3bbe92b73bb2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.