4 files changed, 5 insertions, 4 deletions
diff --git a/apt-pkg/depcache.cc b/apt-pkg/depcache.cc
index ef93a54bb..b66f2bc66 100644
--- a/apt-pkg/depcache.cc
+++ b/apt-pkg/depcache.cc
@@ -2496,7 +2496,7 @@ static bool MarkPackage(pkgCache::PkgIterator const &Pkg,
 // pkgDepCache::MarkRequired - the main mark algorithm			/*{{{*/
 bool pkgDepCache::MarkRequired(InRootSetFunc &userFunc)
 {
-   if (_config->Find("APT::Solver", "internal") != "internal")
+   if (_config->Find("APT::Solver", "internal") != "internal" && _config->Find("APT::Solver") != "3.0")
       return true;
 
    // init the states
diff --git a/apt-pkg/edsp.cc b/apt-pkg/edsp.cc
index 88f572f18..dd9ae18fc 100644
--- a/apt-pkg/edsp.cc
+++ b/apt-pkg/edsp.cc
@@ -754,7 +754,7 @@ static bool CreateDumpFile(char const * const id, char const * const type, FileF
 // EDSP::ResolveExternal - resolve problems by asking external for help	{{{*/
 bool EDSP::ResolveExternal(const char* const solver, pkgDepCache &Cache,
 			 unsigned int const flags, OpProgress *Progress) {
-   if (strcmp(solver, "3.0") == 0)
+   if (strstr(solver, "3.") == solver)
    {
       APT::Solver s(Cache.GetCache(), Cache.GetPolicy());
       FileFd output;
diff --git a/apt-pkg/solver3.cc b/apt-pkg/solver3.cc
index 8af3275eb..44a5075da 100644
--- a/apt-pkg/solver3.cc
+++ b/apt-pkg/solver3.cc
@@ -976,7 +976,7 @@ bool APT::Solver::ToDepCache(pkgDepCache &depcache) const
 	 if (auto RP = reason.Pkg(); RP == P.MapPointer())
 	    reason = (*this)[P].reason;
 
-	 depcache.MarkInstall(P, false, 0, reason.empty());
+	 depcache.MarkInstall(P, false, 0, reason.empty() && not(depcache[P].Flags & pkgCache::Flag::Auto));
 	 if (not P->CurrentVer)
 	    depcache.MarkAuto(P, not reason.empty());
 	 depcache[P].Marked = 1;
diff --git a/apt-pkg/solver3.h b/apt-pkg/solver3.h
index 91b852c98..93e4e5116 100644
--- a/apt-pkg/solver3.h
+++ b/apt-pkg/solver3.h
@@ -217,10 +217,11 @@ class Solver
    time_t startTime;
 
    /// Various configuration options
+   std::string version{_config->Find("APT::Solver", "3.0")};
    // \brief Debug level
    int debug{_config->FindI("Debug::APT::Solver")};
    // \brief If set, we try to keep automatically installed packages installed.
-   bool KeepAuto{not _config->FindB("APT::Get::AutomaticRemove")};
+   bool KeepAuto{version == "3.0" || not _config->FindB("APT::Get::AutomaticRemove")};
    // \brief Determines if we are in upgrade mode.
    bool IsUpgrade{_config->FindB("APT::Solver::Upgrade", false)};
    // \brief If set, removals are allowed.