更新如上镜像之后，显示版本如下：
尝试安装个软件gedit，发现不能成功。
安装任何软件或者库，都会提示未能找到或者依赖不能安装。
第一次用这个板子，不太清楚有什么问题？
下面是source.list文件：
# See UpgradeNotes - Community Help Wiki for how to upgrade to
# newer versions of the distribution.
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic main restricted
deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-updates main restricted
deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic universe
deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic universe
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-updates universe
deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic multiverse
# deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic multiverse
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-updates multiverse
# deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-backports main restricted universe multiverse
# deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical’s
## ‘partner’ repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb Index of /ubuntu bionic partner
# deb-src Index of /ubuntu bionic partner
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-security main restricted
# deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-security main restricted
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-security universe
# deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-security universe
deb ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-security multiverse
# deb-src ubuntu-ports安装包下载-开源镜像站-阿里云 bionic-security multiverse
deb http://wiki.t-firefly.com/firefly-rk3399-repo bionic main