Você precisa dizer a apt para considerar os pacotes de backport:
apt -t jessie-backports install openjdk-8-jre
Eu tenho os seguintes pacotes relacionados ao Java instalados em minha máquina Debian 8
# sudo dpkg -l | grep -i java
ii ca-certificates-java 20140324 all Common CA certificates (JKS keystore)
ii java-common 0.52 all Base of all Java packages
ii libatk-wrapper-java 0.30.5-1 all ATK implementation for Java using JNI
ii libatk-wrapper-java-jni:amd64 0.30.5-1 amd64 ATK implementation for Java using JNI (JNI bindings)
ii openjdk-7-jre:amd64 7u181-2.6.14-1~deb8u1 amd64 OpenJDK Java runtime, using Hotspot JIT
ii openjdk-7-jre-headless:amd64 7u181-2.6.14-1~deb8u1 amd64 OpenJDK Java runtime, using Hotspot JIT (headless)
ii tzdata-java 2018e-0+deb8u1 all time zone and daylight-saving time data for use by java runtimes
Eu só quero instalar o Java 8, mas continuo com problemas de dependências:
# sudo apt install openjdk-8-jre
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:
openjdk-8-jre : Depends: openjdk-8-jre-headless (= 8u171-b11-1~bpo8+1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
# sudo apt install openjdk-8-jre openjdk-8-jre-headless
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:
openjdk-8-jre-headless : Breaks: ca-certificates-java (< 20160321~) but 20140324 is to be installed
E: Unable to correct problems, you have held broken packages.
Como posso atualizar para o Java 8, resolvendo todos os problemas de dependências ao mesmo tempo?