Debian
未滿足的依賴項：libjpeg8 (>= 8c) 但在安裝 R 時無法安裝
嘗試在 Debian 9 (stretch) 上安裝 R 時，我遇到了未滿足的依賴關係。具體來說，執行：
$ sudo apt-get install r-base-core結果是
Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: r-base-core : Depends: libjpeg8 (>= 8c) but it is not installable Recommends: r-recommended but it is not going to be installed Recommends: r-base-dev but it is not going to be installed Recommends: r-doc-html but it is not going to be installed E: Unable to correct problems, you have held broken packages.有人可以幫忙嗎？我已經用Google搜尋了這個問題，但無法提出任何解決方法。
謝謝
編輯：輸出
apt policy是：Package files: 100 /var/lib/dpkg/status release a=now 500 http://repository.spotify.com stable/non-free i386 Packages release v=0.4,o=Spotify LTD,a=stable,n=stable,l=Spotify Public Repository,c=non-free,b=i386 origin repository.spotify.com 500 http://repository.spotify.com stable/non-free amd64 Packages release v=0.4,o=Spotify LTD,a=stable,n=stable,l=Spotify Public Repository,c=non-free,b=amd64 origin repository.spotify.com 500 https://repo.skype.com/deb stable/main amd64 Packages release o=. stable,a=stable,n=stable,l=. stable,c=main,b=amd64 origin repo.skype.com 500 https://desktop-download.mendeley.com/download/apt stable/main i386 Packages release n=stable,c=main,b=i386 origin desktop-download.mendeley.com 500 https://desktop-download.mendeley.com/download/apt stable/main amd64 Packages release n=stable,c=main,b=amd64 origin desktop-download.mendeley.com 500 http://ppa.launchpad.net/maarten-baert/simplescreenrecorder/ubuntu bionic/main i386 Packages release v=18.04,o=LP-PPA-maarten-baert- simplescreenrecorder,a=bionic,n=bionic,l=SimpleScreenRecorder,c=main,b=i386 origin ppa.launchpad.net 500 http://ppa.launchpad.net/maarten-baert/simplescreenrecorder/ubuntu bionic/main amd64 Packages release v=18.04,o=LP-PPA-maarten-baert-simplescreenrecorder,a=bionic,n=bionic,l=SimpleScreenRecorder,c=main,b=amd64 origin ppa.launchpad.net 500 http://deb.debian.org/debian stretch/main i386 Packages release v=9.4,o=Debian,a=stable,n=stretch,l=Debian,c=main,b=i386 origin deb.debian.org 500 http://deb.debian.org/debian stretch/main amd64 Packages release v=9.4,o=Debian,a=stable,n=stretch,l=Debian,c=main,b=amd64 origin deb.debian.org 500 https://dl.winehq.org/wine-builds/debian stretch/main i386 Packages release v=9.0,o=dl.winehq.org,a=stable,n=stretch,l=winehq,c=main,b=i386 origin dl.winehq.org 500 https://dl.winehq.org/wine-builds/debian stretch/main amd64 Packages release v=9.0,o=dl.winehq.org,a=stable,n=stretch,l=winehq,c=main,b=amd64 origin dl.winehq.org 500 http://cran.rstudio.com/bin/linux/debian stretch-cran34/ Packages release o=CRAN,a=stretch-cran34,n=stretch-cran34,l=CRAN Backports,c= origin cran.rstudio.com 500 http://cran.rstudio.com/bin/linux/ubuntu trusty/ Packages release v=14.04,o=CRAN,a=trusty,n=trusty,l=CRAN,c= origin cran.rstudio.com 500 http://ftp.uk.debian.org/debian jessie/main i386 Packages release v=8.10,o=Debian,a=oldstable,n=jessie,l=Debian,c=main,b=i386 origin ftp.uk.debian.org 500 http://ftp.uk.debian.org/debian jessie/main amd64 Packages release v=8.10,o=Debian,a=oldstable,n=jessie,l=Debian,c=main,b=amd64 origin ftp.uk.debian.org 500 http://ftp.uk.debian.org/debian stretch-updates/main i386 Packages release o=Debian,a=stable-updates,n=stretch-updates,l=Debian,c=main,b=i386 origin ftp.uk.debian.org 500 http://ftp.uk.debian.org/debian stretch-updates/main amd64 Packages release o=Debian,a=stable-updates,n=stretch-updates,l=Debian,c=main,b=amd64 origin ftp.uk.debian.org 500 http://ftp.uk.debian.org/debian stretch/contrib i386 Packages release v=9.4,o=Debian,a=stable,n=stretch,l=Debian,c=contrib,b=i386 origin ftp.uk.debian.org 500 http://ftp.uk.debian.org/debian stretch/contrib amd64 Packages release v=9.4,o=Debian,a=stable,n=stretch,l=Debian,c=contrib,b=amd64 origin ftp.uk.debian.org 500 http://ftp.uk.debian.org/debian stretch/non-free i386 Packages release v=9.4,o=Debian,a=stable,n=stretch,l=Debian,c=non-free,b=i386 origin ftp.uk.debian.org 500 http://ftp.uk.debian.org/debian stretch/non-free amd64 Packages release v=9.4,o=Debian,a=stable,n=stretch,l=Debian,c=non-free,b=amd64 origin ftp.uk.debian.org 500 http://ftp.uk.debian.org/debian stretch/main i386 Packages release v=9.4,o=Debian,a=stable,n=stretch,l=Debian,c=main,b=i386 origin ftp.uk.debian.org 500 http://ftp.uk.debian.org/debian stretch/main amd64 Packages release v=9.4,o=Debian,a=stable,n=stretch,l=Debian,c=main,b=amd64 origin ftp.uk.debian.org Pinned packages:
未滿足的依賴關係可能源於您的儲存庫引用的混合版本，特別是針對 Ubuntu 14.04 的 CRAN 儲存庫。您應該刪除（或用 註釋掉
#）以下條目/etc/apt/sources.list和 中的任何文件/etc/apt/sources.list.d：
http://cran.rstudio.com/bin/linux/ubuntu trusty/;- 所有
ftp.uk.debian.org引用的條目jessie。完成此操作後，再次執行不應再因
apt update缺少.apt install r-base-core``libjpeg8